Remove #pragma once. Just from base/ for now.

base/debug/profiler.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_DEBUG_PROFILER_H
 #define BASE_DEBUG_PROFILER_H
-#pragma once
 
 #include <string>
 
 #include "base/base_export.h"
 #include "base/basictypes.h"
 
 // The Profiler functions allow usage of the underlying sampling based
 // profiler. If the application has not been built with the necessary
 // flags (-DENABLE_PROFILING and not -DNO_TCMALLOC) then these functions
 // are noops.
@@ skipping 41 matching lines @@
 // If this binary is instrumented and the instrumentation supplies a return
 // address resolution function, finds and returns the address resolution
 // function. Otherwise returns NULL.
 BASE_EXPORT ReturnAddressLocationResolver
     GetProfilerReturnAddrResolutionFunc();
 
 }  // namespace debug
 }  // namespace base
 
 #endif  // BASE_DEBUG_DEBUGGER_H