diff -up chromium-63.0.3239.84/gpu/ipc/common/mailbox_struct_traits.h.gcc5-r3 chromium-63.0.3239.84/gpu/ipc/common/mailbox_struct_traits.h
--- chromium-63.0.3239.84/gpu/ipc/common/mailbox_struct_traits.h.gcc5-r3	2017-12-06 15:05:28.000000000 -0500
+++ chromium-63.0.3239.84/gpu/ipc/common/mailbox_struct_traits.h	2017-12-07 11:32:15.416636125 -0500
@@ -15,7 +15,7 @@ namespace mojo {
 template <>
 struct StructTraits<gpu::mojom::MailboxDataView, gpu::Mailbox> {
   static base::span<const int8_t> name(const gpu::Mailbox& mailbox) {
-    return mailbox.name;
+    return base::make_span(mailbox.name);
   }
   static bool Read(gpu::mojom::MailboxDataView data, gpu::Mailbox* out);
 };
diff -up chromium-63.0.3239.84/services/viz/public/cpp/compositing/filter_operation_struct_traits.h.gcc5-r3 chromium-63.0.3239.84/services/viz/public/cpp/compositing/filter_operation_struct_traits.h
--- chromium-63.0.3239.84/services/viz/public/cpp/compositing/filter_operation_struct_traits.h.gcc5-r3	2017-12-06 15:05:31.000000000 -0500
+++ chromium-63.0.3239.84/services/viz/public/cpp/compositing/filter_operation_struct_traits.h	2017-12-07 11:32:15.422636011 -0500
@@ -134,7 +134,7 @@ struct StructTraits<viz::mojom::FilterOp
   static base::span<const float> matrix(const cc::FilterOperation& operation) {
     if (operation.type() != cc::FilterOperation::COLOR_MATRIX)
       return base::span<const float>();
-    return operation.matrix();
+    return base::make_span(operation.matrix());
   }
 
   static base::span<const gfx::Rect> shape(
diff -up chromium-63.0.3239.84/services/viz/public/cpp/compositing/quads_struct_traits.h.gcc5-r3 chromium-63.0.3239.84/services/viz/public/cpp/compositing/quads_struct_traits.h
--- chromium-63.0.3239.84/services/viz/public/cpp/compositing/quads_struct_traits.h.gcc5-r3	2017-12-07 11:32:15.429635877 -0500
+++ chromium-63.0.3239.84/services/viz/public/cpp/compositing/quads_struct_traits.h	2017-12-07 11:34:00.081601880 -0500
@@ -309,7 +309,7 @@ struct StructTraits<viz::mojom::TextureQ
   static base::span<const float> vertex_opacity(const viz::DrawQuad& input) {
     const viz::TextureDrawQuad* quad =
         viz::TextureDrawQuad::MaterialCast(&input);
-    return quad->vertex_opacity;
+    return base::make_span(quad->vertex_opacity);
   }
 
   static bool y_flipped(const viz::DrawQuad& input) {
diff -up chromium-63.0.3239.84/third_party/WebKit/Source/platform/exported/WebCORS.cpp.gcc5-r3 chromium-63.0.3239.84/third_party/WebKit/Source/platform/exported/WebCORS.cpp
--- chromium-63.0.3239.84/third_party/WebKit/Source/platform/exported/WebCORS.cpp.gcc5-r3	2017-12-06 15:05:46.000000000 -0500
+++ chromium-63.0.3239.84/third_party/WebKit/Source/platform/exported/WebCORS.cpp	2017-12-07 11:32:15.430635859 -0500
@@ -480,7 +480,7 @@ WebString AccessControlErrorString(
     }
     default:
       NOTREACHED();
-      return "";
+      return WebString();
   }
 }
 
@@ -512,7 +512,7 @@ WebString PreflightErrorString(const Pre
     }
     default:
       NOTREACHED();
-      return "";
+      return WebString();
   }
 }
 
@@ -533,7 +533,7 @@ WebString RedirectErrorString(const Redi
     }
     default:
       NOTREACHED();
-      return "";
+      return WebString();
   }
 }
 
diff -up chromium-63.0.3239.84/third_party/WebKit/Source/platform/wtf/typed_arrays/ArrayBufferContents.h.gcc5-r3 chromium-63.0.3239.84/third_party/WebKit/Source/platform/wtf/typed_arrays/ArrayBufferContents.h
--- chromium-63.0.3239.84/third_party/WebKit/Source/platform/wtf/typed_arrays/ArrayBufferContents.h.gcc5-r3	2017-12-06 15:05:46.000000000 -0500
+++ chromium-63.0.3239.84/third_party/WebKit/Source/platform/wtf/typed_arrays/ArrayBufferContents.h	2017-12-07 11:32:15.408636277 -0500
@@ -63,7 +63,7 @@ class WTF_EXPORT ArrayBufferContents {
           allocation_length_(0),
           data_(data),
           data_length_(0),
-          kind_(AllocationKind::kNormal),
+          kind_(WTF::ArrayBufferContents::AllocationKind::kNormal),
           deleter_(deleter) {}
     DataHandle(void* allocation_base,
                size_t allocation_length,
@@ -94,11 +94,11 @@ class WTF_EXPORT ArrayBufferContents {
              reinterpret_cast<uintptr_t>(allocation_base_) +
                  allocation_length_);
       switch (kind_) {
-        case AllocationKind::kNormal:
+        case WTF::ArrayBufferContents::AllocationKind::kNormal:
           DCHECK(deleter_);
           deleter_(data_);
           return;
-        case AllocationKind::kReservation:
+        case WTF::ArrayBufferContents::AllocationKind::kReservation:
           ReleaseReservedMemory(allocation_base_, allocation_length_);
           return;
       }
diff -up chromium-63.0.3239.84/third_party/webrtc/modules/audio_processing/aec3/aec_state.cc.gcc5-r3 chromium-63.0.3239.84/third_party/webrtc/modules/audio_processing/aec3/aec_state.cc
--- chromium-63.0.3239.84/third_party/webrtc/modules/audio_processing/aec3/aec_state.cc.gcc5-r3	2017-12-07 11:32:15.409636258 -0500
+++ chromium-63.0.3239.84/third_party/webrtc/modules/audio_processing/aec3/aec_state.cc	2017-12-07 11:33:10.714561105 -0500
@@ -10,7 +10,7 @@
 
 #include "modules/audio_processing/aec3/aec_state.h"
 
-#include <math.h>
+#include <cmath>
 #include <numeric>
 #include <vector>