Don't build the main executable binaries as Objective-C

chrome/app/chrome_main_posix.cc

 // 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.
 
 #include "chrome/app/chrome_main.h"
 
 #include <signal.h>
 
 #include "base/global_descriptors_posix.h"
 #include "base/logging.h"
@@ skipping 28 matching lines @@
   CHECK(signal(SIGPIPE, SIG_IGN) != SIG_ERR);
 }
 
 }  // anonymous namespace
 
 namespace chrome_main {
 
 void LowLevelInit(void* instance) {
 #if defined(OS_MACOSX)
   // TODO(mark): Some of these things ought to be handled in
-  // chrome_exe_main_mac.mm.  Under the current architecture, nothing
+  // chrome_exe_main_mac.cc.  Under the current architecture, nothing
   // in chrome_exe_main can rely directly on chrome_dll code on the
   // Mac, though, so until some of this code is refactored to avoid
   // such a dependency, it lives here.  See also the TODO(mark)
   // at InitCrashReporter() and DestructCrashReporter().
   base::EnableTerminationOnHeapCorruption();
   base::EnableTerminationOnOutOfMemory();
 #endif  // OS_MACOSX
 
   // Set C library locale to make sure CommandLine can parse argument values
   // in correct encoding.
@@ skipping 18 matching lines @@
 }
 
 #if !defined(OS_MACOSX)
 // This policy is not implemented for Linux and ChromeOS. The win and mac ver-
 // sions are implemented in the platform specific version of chrome_main.cc e.g.
 // chrome_main_win.cc or chrome_main_mac.mm .
 void CheckUserDataDirPolicy(FilePath* user_data_dir) {}
 #endif
 
 }  // namespace chrome_main