Revert of Idle cleanup for worker context

content/common/gpu/client/context_provider_command_buffer.cc

Index: content/common/gpu/client/context_provider_command_buffer.cc
diff --git a/content/common/gpu/client/context_provider_command_buffer.cc b/content/common/gpu/client/context_provider_command_buffer.cc
index e717ac253b396ced39fdf64bb026aab00962333c..0a6770415584f897786603e69dc4788471fb0738 100644
--- a/content/common/gpu/client/context_provider_command_buffer.cc
+++ b/content/common/gpu/client/context_provider_command_buffer.cc
@@ -245,13 +245,11 @@
   ContextGL()->TraceBeginCHROMIUM("gpu_toplevel", unique_context_name.c_str());
   // If support_locking_ is true, the context may be used from multiple
   // threads, and any async callstacks will need to hold the same lock, so
-  // give it to the command buffer and cache controller.
+  // give it to the command buffer.
   // We don't hold a lock here since there's no need, so set the lock very last
   // to prevent asserts that we're not holding it.
-  if (support_locking_) {
+  if (support_locking_)
     command_buffer_->SetLock(&context_lock_);
-    cache_controller_->SetLock(&context_lock_);
-  }
   return true;
 }