Revert of cc: Implement shared worker contexts.

cc/test/test_context_provider.cc

Index: cc/test/test_context_provider.cc
diff --git a/cc/test/test_context_provider.cc b/cc/test/test_context_provider.cc
index 5e43ee3fcc5892c73b5afa24124d42c2479a57b5..ca7714d30cf9f4ca1b0eaaaeb7c117f7ddd180de 100644
--- a/cc/test/test_context_provider.cc
+++ b/cc/test/test_context_provider.cc
@@ -19,20 +19,7 @@
 
 // static
 scoped_refptr<TestContextProvider> TestContextProvider::Create() {
-  return Create(TestWebGraphicsContext3D::Create());
-}
-
-// static
-scoped_refptr<TestContextProvider> TestContextProvider::CreateWorker() {
-  scoped_refptr<TestContextProvider> worker_context_provider =
-      Create(TestWebGraphicsContext3D::Create());
-  if (!worker_context_provider)
-    return nullptr;
-  // Worker contexts are bound to the thread they are created on.
-  if (!worker_context_provider->BindToCurrentThread())
-    return nullptr;
-  worker_context_provider->SetupLock();
-  return worker_context_provider;
+  return Create(TestWebGraphicsContext3D::Create().Pass());
 }
 
 // static