Make chrome/browser/chrome_browser_main_linux.* Linux-only.

chrome/browser/chrome_browser_main_mac.mm

 // 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 "chrome/browser/chrome_browser_main_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/command_line.h"
 #include "base/debug/debugger.h"
@@ skipping 96 matching lines @@
   // This is a no-op if the KeystoneRegistration framework is not present.
   // The framework is only distributed with branded Google Chrome builds.
   [[KeystoneGlue defaultKeystoneGlue] registerWithKeystone];
 
   // Prevent Cocoa from turning command-line arguments into
   // |-application:openFiles:|, since we already handle them directly.
   [[NSUserDefaults standardUserDefaults]
       setObject:@"NO" forKey:@"NSTreatUnknownArgumentsAsOpen"];
 }
 
-void ChromeBrowserMainPartsMac::ShowMissingLocaleMessageBox() {
-  // Not called on Mac because we load the locale files differently.
-  NOTREACHED();
-}
-
 void ChromeBrowserMainPartsMac::DidEndMainMessageLoop() {
   AppController* appController = [NSApp delegate];
   [appController didEndMainMessageLoop];
 }