Call QuitNow instead of exit(0) to kill GPU process.

content/common/gpu/gpu_command_buffer_stub.cc

Index: content/common/gpu/gpu_command_buffer_stub.cc
diff --git a/content/common/gpu/gpu_command_buffer_stub.cc b/content/common/gpu/gpu_command_buffer_stub.cc
index 87035bf9796f85ec2cc57820c4727970f2df6d9f..d0ed3d1c42908ca3b99bd7de42dc60870fad4c93 100644
--- a/content/common/gpu/gpu_command_buffer_stub.cc
+++ b/content/common/gpu/gpu_command_buffer_stub.cc
@@ -1142,10 +1142,9 @@ bool GpuCommandBufferStub::CheckContextLost() {
             switches::kInProcessGPU)) {
       LOG(ERROR) << "Exiting GPU process because some drivers cannot recover"
                  << " from problems.";
-#if defined(OS_WIN)
-      base::win::SetShouldCrashOnProcessDetach(false);
-#endif
-      exit(0);
+      // Signal the message loop to quit to shut down other threads
+      // gracefully.
+      base::MessageLoop::current()->QuitNow();
     }
 
     // Lose all other contexts if the reset was triggered by the robustness