Remove redundant codepath for webgl api blocking

gpu/ipc/service/gpu_channel_manager.cc

Index: gpu/ipc/service/gpu_channel_manager.cc
diff --git a/gpu/ipc/service/gpu_channel_manager.cc b/gpu/ipc/service/gpu_channel_manager.cc
index 1edf84976ac6ff3ce99709188d0ccf027d8fd85f..8a1f8a4dd08e62351d437747cafa07980e258b87 100644
--- a/gpu/ipc/service/gpu_channel_manager.cc
+++ b/gpu/ipc/service/gpu_channel_manager.cc
@@ -62,6 +62,7 @@ GpuChannelManager::GpuChannelManager(
       sync_point_client_waiter_(
           sync_point_manager->CreateSyncPointClientWaiter()),
       gpu_memory_buffer_factory_(gpu_memory_buffer_factory),
+      exiting_for_lost_context_(false),
       weak_factory_(this) {
   DCHECK(task_runner);
   DCHECK(io_task_runner);
@@ -247,6 +248,17 @@ void GpuChannelManager::LoseAllContexts() {
                                     weak_factory_.GetWeakPtr()));
 }
 
+void GpuChannelManager::MaybeExitOnContextLost() {
+  if (!gpu_preferences().single_process && !gpu_preferences().in_process_gpu) {
+    LOG(ERROR) << "Exiting GPU process because some drivers cannot recover"
+               << " from problems.";
+    // Signal the message loop to quit to shut down other threads
+    // gracefully.
+    base::MessageLoop::current()->QuitNow();
+    exiting_for_lost_context_ = true;
+  }
+}
+
 void GpuChannelManager::DestroyAllChannels() {
   gpu_channels_.clear();
 }