Revert 152040 - GPU process exits with error code on failure to initialize.

I think exiting with no error is counted as a GPU process crash for crash stats purposes.

Review URL: https://chromiumcodereview.appspot.com/10823375

TBR=apatrick@chromium.org
Review URL: https://chromiumcodereview.appspot.com/10854235

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@152380 0039d316-1c4b-4281-b951-d872f2087c98

content/gpu/gpu_child_thread.cc

@@ -17,7 +17,6 @@
 #include "content/gpu/gpu_watchdog_thread.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/content_switches.h"
-#include "content/public/common/result_codes.h"
 #include "ipc/ipc_channel_handle.h"
 #include "ipc/ipc_sync_message_filter.h"
 #include "ui/gl/gl_implementation.h"
@@ -117,12 +116,8 @@ bool GpuChildThread::OnControlMessageReceived(const IPC::Message& msg) {
 void GpuChildThread::OnInitialize() {
   if (dead_on_arrival_) {
     VLOG(1) << "Exiting GPU process due to errors during initialization";
-
-    // Exit with the exit code that would be returned if the GPU process was
-    // killed using task mamager so that it does not count as a crash.
-    // TODO(apatrick): this is temporary to see if this impacts the crash
-    // statistics. If it does then the crash accounting should be fixed.
-    exit(content::RESULT_CODE_KILLED);
+    MessageLoop::current()->Quit();
+    return;
   }
 
   // We don't need to pipe log messages if we are running the GPU thread in