Switch to use SharedBitmapManager all the time in cc_unittests

cc/layers/scrollbar_layer_unittest.cc

Index: cc/layers/scrollbar_layer_unittest.cc
diff --git a/cc/layers/scrollbar_layer_unittest.cc b/cc/layers/scrollbar_layer_unittest.cc
index ccba3ae172c53a5f04f377c226acf83b81e4047f..a92229a08b83623e0a37e7dfea0dd01efa659a78 100644
--- a/cc/layers/scrollbar_layer_unittest.cc
+++ b/cc/layers/scrollbar_layer_unittest.cc
@@ -390,7 +390,8 @@ class ScrollbarLayerSolidColorThumbTest : public testing::Test {
  public:
   ScrollbarLayerSolidColorThumbTest() {
     LayerTreeSettings layer_tree_settings;
-    host_impl_.reset(new FakeLayerTreeHostImpl(layer_tree_settings, &proxy_));
+    host_impl_.reset(new FakeLayerTreeHostImpl(
+        layer_tree_settings, &proxy_, &shared_bitmap_manager_));
 
     const int kThumbThickness = 3;
     const bool kIsLeftSideVerticalScrollbar = false;
@@ -414,6 +415,7 @@ class ScrollbarLayerSolidColorThumbTest : public testing::Test {
 
  protected:
   FakeImplProxy proxy_;
+  TestSharedBitmapManager shared_bitmap_manager_;
   scoped_ptr<FakeLayerTreeHostImpl> host_impl_;
   scoped_ptr<SolidColorScrollbarLayerImpl> horizontal_scrollbar_layer_;
   scoped_ptr<SolidColorScrollbarLayerImpl> vertical_scrollbar_layer_;