Remove STATIC_CONST_MEMBER_DEFINITION.

base/compiler_specific.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_COMPILER_SPECIFIC_H_
 #define BASE_COMPILER_SPECIFIC_H_
 
 #include "build/build_config.h"
 
 #if defined(COMPILER_MSVC)
@@ skipping 50 matching lines @@
 #define MSVC_PUSH_DISABLE_WARNING(n)
 #define MSVC_PUSH_WARNING_LEVEL(n)
 #define MSVC_POP_WARNING()
 #define MSVC_DISABLE_OPTIMIZE()
 #define MSVC_ENABLE_OPTIMIZE()
 #define NON_EXPORTED_BASE(code) code
 
 #endif  // COMPILER_MSVC
 
 
-// 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(COMPILER_MSVC)
-#define STATIC_CONST_MEMBER_DEFINITION __declspec(selectany)
-#else
-#define STATIC_CONST_MEMBER_DEFINITION
-#endif
-
 // Annotate a variable indicating it's ok if the variable is not used.
 // (Typically used to silence a compiler warning when the assignment
 // is important for some other reason.)
 // Use like:
 //   int x = ...;
 //   ALLOW_UNUSED_LOCAL(x);
 #define ALLOW_UNUSED_LOCAL(x) false ? (void)x : (void)0
 
 // Annotate a typedef or function indicating it's ok if it's not used.
 // Use like:
@@ skipping 95 matching lines @@
 // Macro for hinting that an expression is likely to be false.
 #if !defined(UNLIKELY)
 #if defined(COMPILER_GCC)
 #define UNLIKELY(x) __builtin_expect(!!(x), 0)
 #else
 #define UNLIKELY(x) (x)
 #endif  // defined(COMPILER_GCC)
 #endif  // !defined(UNLIKELY)
 
 #endif  // BASE_COMPILER_SPECIFIC_H_