compositor-worker: Remove code from cc_blink

cc/blink/web_compositor_mutable_state_provider_impl.cc

Index: cc/blink/web_compositor_mutable_state_provider_impl.cc
diff --git a/cc/blink/web_compositor_mutable_state_provider_impl.cc b/cc/blink/web_compositor_mutable_state_provider_impl.cc
deleted file mode 100644
index 713a5428a5d1aad3d1fee91efc0fbc7f759c1cde..0000000000000000000000000000000000000000
--- a/cc/blink/web_compositor_mutable_state_provider_impl.cc
+++ /dev/null
@@ -1,34 +0,0 @@
-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "cc/blink/web_compositor_mutable_state_provider_impl.h"
-
-#include "cc/blink/web_compositor_mutable_state_impl.h"
-#include "cc/layers/layer_impl.h"
-#include "cc/trees/layer_tree_impl.h"
-
-namespace cc_blink {
-
-WebCompositorMutableStateProviderImpl::WebCompositorMutableStateProviderImpl(
-    cc::LayerTreeImpl* state,
-    cc::LayerTreeMutationMap* mutations)
-    : state_(state), mutations_(mutations) {}
-
-WebCompositorMutableStateProviderImpl::
-    ~WebCompositorMutableStateProviderImpl() {}
-
-blink::WebPassOwnPtr<blink::WebCompositorMutableState>
-WebCompositorMutableStateProviderImpl::getMutableStateFor(uint64_t element_id) {
-  cc::LayerTreeImpl::ElementLayers layers =
-      state_->GetMutableLayers(element_id);
-
-  if (!layers.main && !layers.scroll)
-    return nullptr;
-
-  return blink::adoptWebPtr<blink::WebCompositorMutableState>(
-      new WebCompositorMutableStateImpl(&(*mutations_)[element_id], layers.main,
-                                        layers.scroll));
-}
-
-}  // namespace cc_blink