Update mojo sdk to rev f84766d3b6420b7cf6a113d9d65d73cb5fe18d90

third_party/mojo/src/mojo/public/cpp/system/macros.h

Index: third_party/mojo/src/mojo/public/cpp/system/macros.h
diff --git a/third_party/mojo/src/mojo/public/cpp/system/macros.h b/third_party/mojo/src/mojo/public/cpp/system/macros.h
index 8c7998961fc2b86df11a7ac64b49ba2d729c6c3f..9836e99f369b82a4b5e056b18eb17a56f34424c2 100644
--- a/third_party/mojo/src/mojo/public/cpp/system/macros.h
+++ b/third_party/mojo/src/mojo/public/cpp/system/macros.h
@@ -42,4 +42,27 @@ char(&ArraySizeHelper(const T(&array)[N]))[N];
   typedef void MoveOnlyTypeForCPP03;                                           \
                                                                                \
  private:
+
+// The C++ standard requires that static const members have an out-of-class
+// definition (in a single compilation unit), but MSVC chokes on this (when
+// language extensions, which are required, are enabled). (You're only likely to
+// notice the need for a definition if you take the address of the member or,
+// more commonly, pass it to a function that takes it as a reference argument --
+// probably an STL function.) This macro makes MSVC do the right thing. See
+// http://msdn.microsoft.com/en-us/library/34h23df8(v=vs.100).aspx for more
+// information. Use like:
+//
+// In .h file:
+//   struct Foo {
+//     static const int kBar = 5;
+//   };
+//
+// In .cc file:
+//   STATIC_CONST_MEMBER_DEFINITION const int Foo::kBar;
+#if defined(_MSC_VER)
+#define MOJO_STATIC_CONST_MEMBER_DEFINITION __declspec(selectany)
+#else
+#define MOJO_STATIC_CONST_MEMBER_DEFINITION
+#endif
+
 #endif  // MOJO_PUBLIC_CPP_SYSTEM_MACROS_H_