cc: one copy is default as well as final fallback.

cc/trees/layer_tree_host_unittest.cc

Index: cc/trees/layer_tree_host_unittest.cc
diff --git a/cc/trees/layer_tree_host_unittest.cc b/cc/trees/layer_tree_host_unittest.cc
index 6c3ae9e86bf5484b536468d4b271ea448d8f85a6..e16f3e6097f33d8201c761569bfe83c9ffd83f80 100644
--- a/cc/trees/layer_tree_host_unittest.cc
+++ b/cc/trees/layer_tree_host_unittest.cc
@@ -1611,7 +1611,6 @@ class LayerTreeHostTestCompositeImmediatelyStateTransitions
   void InitializeSettings(LayerTreeSettings* settings) override {
     settings->single_thread_proxy_scheduler = false;
     settings->use_zero_copy = true;
-    settings->use_one_copy = false;
   }
 
   void BeginTest() override {
@@ -3606,7 +3605,6 @@ class LayerTreeHostTestMaxTransferBufferUsageBytes : public LayerTreeHostTest {
   void InitializeSettings(LayerTreeSettings* settings) override {
     // Testing async uploads.
     settings->use_zero_copy = false;
-    settings->use_one_copy = false;
   }
 
   scoped_ptr<FakeOutputSurface> CreateFakeOutputSurface() override {
@@ -4641,7 +4639,6 @@ class LayerTreeHostTestSynchronousCompositeSwapPromise
   void InitializeSettings(LayerTreeSettings* settings) override {
     settings->single_thread_proxy_scheduler = false;
     settings->use_zero_copy = true;
-    settings->use_one_copy = false;
   }
 
   void BeginTest() override {
@@ -4946,7 +4943,6 @@ class LayerTreeHostTestCrispUpAfterPinchEndsWithOneCopy
     : public LayerTreeHostTestCrispUpAfterPinchEnds {
  protected:
   void InitializeSettings(LayerTreeSettings* settings) override {
-    settings->use_one_copy = true;
   }
 
   scoped_ptr<FakeOutputSurface> CreateFakeOutputSurface() override {