Remove WebGraphicsContext3D reason from the CauseForGpuLaunch enum

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 8cf559524e05d3ec6781cfacfa776ce2d2952718..55a89e94624281f5dba9a3c175c839233a9c5de3 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -1444,7 +1444,7 @@ RenderThreadImpl::SharedMainThreadContextProvider() {
     return shared_main_thread_contexts_;
 
   scoped_refptr<gpu::GpuChannelHost> gpu_channel_host(EstablishGpuChannelSync(
-      CAUSE_FOR_GPU_LAUNCH_WEBGRAPHICSCONTEXT3DCOMMANDBUFFERIMPL_INITIALIZE));
+      CAUSE_FOR_GPU_LAUNCH_RENDERER_SHARED_MAIN_THREAD_CONTEXT));
   if (!gpu_channel_host) {
     shared_main_thread_contexts_ = nullptr;
     return nullptr;
@@ -1791,11 +1791,9 @@ RenderThreadImpl::GetPeerConnectionDependencyFactory() {
 
 gpu::GpuChannelHost* RenderThreadImpl::GetGpuChannel() {
   if (!gpu_channel_)
-    return NULL;
-
+    return nullptr;
   if (gpu_channel_->IsLost())
-    return NULL;
-
+    return nullptr;
   return gpu_channel_.get();
 }
 
@@ -1941,7 +1939,7 @@ RenderThreadImpl::SharedWorkerContextProvider() {
   }
 
   scoped_refptr<gpu::GpuChannelHost> gpu_channel_host(EstablishGpuChannelSync(
-      CAUSE_FOR_GPU_LAUNCH_WEBGRAPHICSCONTEXT3DCOMMANDBUFFERIMPL_INITIALIZE));
+      CAUSE_FOR_GPU_LAUNCH_SHARED_WORKER_THREAD_CONTEXT));
   if (!gpu_channel_host) {
     shared_worker_context_provider_ = nullptr;
     return shared_worker_context_provider_;