Move base/debug_on_start to base/debugger and rename it to be _win since it...

base/debug/debug_on_start_win.h

-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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.
 
 // Define the necessary code and global data to look for kDebugOnStart command
 // line argument. When the command line argument is detected, it invokes the
 // debugger, if no system-wide debugger is registered, a debug break is done.
 
-#ifndef BASE_DEBUG_ON_START_H_
-#define BASE_DEBUG_ON_START_H_
+#ifndef BASE_DEBUG_DEBUG_ON_START_WIN_H_
+#define BASE_DEBUG_DEBUG_ON_START_WIN_H_
 #pragma once
 
 #include "base/basictypes.h"
+#include "build/build_config.h"
 
-// This only works on Windows.
+// This only works on Windows. It's legal to include on other platforms, but
+// will be a NOP.
 #if defined(OS_WIN)
 
 #ifndef DECLSPEC_SELECTANY
 #define DECLSPEC_SELECTANY  __declspec(selectany)
 #endif
 
+namespace base {
+namespace debug {
+
 // Debug on start functions and data.
 class DebugOnStart {
  public:
   // Expected function type in the .CRT$XI* section.
   // Note: See VC\crt\src\internal.h for reference.
   typedef int  (__cdecl *PIFV)(void);
 
   // Looks at the command line for kDebugOnStart argument. If found, it invokes
   // the debugger, if this fails, it crashes.
   static int __cdecl Init();
@@ skipping 23 matching lines @@
 #else  // _WIN64
 
 // "Fix" the segment. On x86, the .CRT segment is merged into the .data segment
 // so it contains non-const data only.
 #pragma data_seg(push, ".CRT$XIB")
 // Declare the pointer so the CRT will find it.
 DECLSPEC_SELECTANY DebugOnStart::PIFV debug_on_start = &DebugOnStart::Init;
 // Fix back the segment.
 #pragma data_seg(pop)
 
+}  // namespace debug
+}  // namespace base
+
 #endif  // _WIN64
 #endif  // defined(OS_WIN)
 
-#endif  // BASE_DEBUG_ON_START_H_
+#endif  // BASE_DEBUG_DEBUG_ON_START_WIN_H_