diff -up chromium-77.0.3865.75/base/task/promise/dependent_list.h.base-gcc-no-alignas chromium-77.0.3865.75/base/task/promise/dependent_list.h
--- chromium-77.0.3865.75/base/task/promise/dependent_list.h.base-gcc-no-alignas	2019-09-13 21:45:51.873172347 +0200
+++ chromium-77.0.3865.75/base/task/promise/dependent_list.h	2019-09-13 21:46:21.661522514 +0200
@@ -59,7 +59,7 @@ class BASE_EXPORT DependentList {
 
   // Align Node on an 8-byte boundary to ensure the first 3 bits are 0 and can
   // be used to store additional state (see static_asserts below).
-  class BASE_EXPORT alignas(8) Node {
+  class BASE_EXPORT ALIGNAS(8) Node {
    public:
     Node();
     explicit Node(Node&& other) noexcept;
--- a/third_party/protobuf/src/google/protobuf/arena.h
+++ b/third_party/protobuf/src/google/protobuf/arena.h
@@ -245,7 +245,7 @@ struct ArenaOptions {
 // well as protobuf container types like RepeatedPtrField and Map. The protocol
 // is internal to protobuf and is not guaranteed to be stable. Non-proto types
 // should not rely on this protocol.
-class PROTOBUF_EXPORT alignas(8) Arena final {
+class PROTOBUF_EXPORT PROTOBUF_ALIGNAS(8) Arena final {
  public:
   // Arena constructor taking custom options. See ArenaOptions below for
   // descriptions of the options available.
--- a/third_party/protobuf/src/google/protobuf/port_def.inc
+++ b/third_party/protobuf/src/google/protobuf/port_def.inc
@@ -528,6 +528,35 @@ PROTOBUF_EXPORT_TEMPLATE_TEST(DEFAULT, __declspec(dllimport));
 #undef IN
 #endif  // _MSC_VER
 
+// Specify memory alignment for structs, classes, etc.
+// Use like:
+//   class PROTOBUF_ALIGNAS(16) MyClass { ... }
+//   PROTOBUF_ALIGNAS(16) int array[4];
+//
+// In most places you can use the C++11 keyword "alignas", which is preferred.
+//
+// But compilers have trouble mixing __attribute__((...)) syntax with
+// alignas(...) syntax.
+//
+// Doesn't work in clang or gcc:
+//   struct alignas(16) __attribute__((packed)) S { char c; };
+// Works in clang but not gcc:
+//   struct __attribute__((packed)) alignas(16) S2 { char c; };
+// Works in clang and gcc:
+//   struct alignas(16) S3 { char c; } __attribute__((packed));
+//
+// There are also some attributes that must be specified *before* a class
+// definition: visibility (used for exporting functions/classes) is one of
+// these attributes. This means that it is not possible to use alignas() with a
+// class that is marked as exported.
+#if defined(_MSC_VER)
+#define PROTOBUF_ALIGNAS(byte_alignment) __declspec(align(byte_alignment))
+#elif defined(__GNUC__)
+#define PROTOBUF_ALIGNAS(byte_alignment) __attribute__((aligned(byte_alignment)))
+#else
+#define PROTOBUF_ALIGNAS(byte_alignment) alignas(byte_alignment)
+#endif
+
 #if defined(__clang__)
 #pragma clang diagnostic push
 // TODO(gerbens) ideally we cleanup the code. But a cursory try shows many
--- a/third_party/protobuf/src/google/protobuf/port_undef.inc
+++ b/third_party/protobuf/src/google/protobuf/port_undef.inc
@@ -80,6 +80,7 @@
 #undef PROTOBUF_EXPORT_TEMPLATE_STYLE_MATCH_foj3FJo5StF0OvIzl7oMxA__declspec
 #undef PROTOBUF_EXPORT_TEMPLATE_STYLE_MATCH_DECLSPEC_dllexport
 #undef PROTOBUF_EXPORT_TEMPLATE_STYLE_MATCH_DECLSPEC_dllimport
+#undef PROTOBUF_ALIGNAS