Remove CreateGpuMemoryBufferFromClientId and plumbing

cc/output/overlay_unittest.cc

Index: cc/output/overlay_unittest.cc
diff --git a/cc/output/overlay_unittest.cc b/cc/output/overlay_unittest.cc
index 7908ced03082975bb212e3f2a9713930dfe3d93c..2e215b9078a7aa134b96d5c25cef26d8b6fa5550 100644
--- a/cc/output/overlay_unittest.cc
+++ b/cc/output/overlay_unittest.cc
@@ -197,9 +197,9 @@ std::unique_ptr<RenderPass> CreateRenderPass() {
 ResourceId CreateResource(ResourceProvider* resource_provider,
                           const gfx::Size& size,
                           bool is_overlay_candidate) {
-  TextureMailbox mailbox = TextureMailbox(
-      gpu::Mailbox::Generate(), gpu::SyncToken(), GL_TEXTURE_2D, size,
-      gfx::GpuMemoryBufferId(), is_overlay_candidate, false);
+  TextureMailbox mailbox =
+      TextureMailbox(gpu::Mailbox::Generate(), gpu::SyncToken(), GL_TEXTURE_2D,
+                     size, is_overlay_candidate, false);
   std::unique_ptr<SingleReleaseCallbackImpl> release_callback =
       SingleReleaseCallbackImpl::Create(base::Bind(&MailboxReleased));