Do not prelaunch GPU process at browser startup.

content/browser/browser_main_loop.cc

Index: content/browser/browser_main_loop.cc
===================================================================
--- content/browser/browser_main_loop.cc	(revision 142968)
+++ content/browser/browser_main_loop.cc	(working copy)
@@ -588,20 +588,6 @@
   speech_recognition_manager_.reset(new speech::SpeechRecognitionManagerImpl());
 #endif
 
-  // When running the GPU thread in-process, avoid optimistically starting it
-  // since creating the GPU thread races against creation of the one-and-only
-  // ChildProcess instance which is created by the renderer thread.
-  if (!parsed_command_line_.HasSwitch(switches::kDisableGpuProcessPrelaunch) &&
-      !parsed_command_line_.HasSwitch(switches::kSingleProcess) &&
-      !parsed_command_line_.HasSwitch(switches::kInProcessGPU)) {
-    TRACE_EVENT_INSTANT0("gpu", "Post task to launch GPU process");
-    BrowserThread::PostTask(
-        BrowserThread::IO, FROM_HERE, base::Bind(
-            base::IgnoreResult(&GpuProcessHost::Get),
-            GpuProcessHost::GPU_PROCESS_KIND_SANDBOXED,
-            content::CAUSE_FOR_GPU_LAUNCH_BROWSER_STARTUP));
-  }
-
   // Start the GpuDataManager before we set up the MessageLoops because
   // otherwise we'll trigger the assertion about doing IO on the UI thread.
   content::GpuDataManager::GetInstance();