Using "static_assert" in lieu of "COMPILE_ASSERT" in extensions module

extensions/browser/api/declarative_webrequest/request_stage.cc

 // 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.
 
 #include "extensions/browser/api/declarative_webrequest/request_stage.h"
 
 #include "base/basictypes.h"
 
 namespace extensions {
 
 const unsigned int kActiveStages = ON_BEFORE_REQUEST |
                                    ON_BEFORE_SEND_HEADERS |
                                    ON_HEADERS_RECEIVED |
                                    ON_AUTH_REQUIRED;
 
 // HighestBit<n> computes the highest bit of |n| in compile time, provided that
 // |n| is a positive compile-time constant.
 template <long unsigned int n>
 struct HighestBit {
-  COMPILE_ASSERT(n > 0, argument_is_not_a_positive_compile_time_constant);
+  static_assert(n > 0, "argument is not a positive compile time constant");
   enum { VALUE = HighestBit<(n >> 1)>::VALUE << 1 };
 };
 template <>
 struct HighestBit<1> {
   enum { VALUE = 1 };
 };
 
 const unsigned int kLastActiveStage = HighestBit<kActiveStages>::VALUE;
 
 }  // namespace extensions