Remove WebGraphicsContext3D getter from cc::ContextProvider

cc/trees/layer_tree_host_unittest_delegated.cc

Index: cc/trees/layer_tree_host_unittest_delegated.cc
diff --git a/cc/trees/layer_tree_host_unittest_delegated.cc b/cc/trees/layer_tree_host_unittest_delegated.cc
index a45d01c3a9cf672604b49385ce550d24338daeb8..9d4278a47d87206467250534523695f28ed70b30 100644
--- a/cc/trees/layer_tree_host_unittest_delegated.cc
+++ b/cc/trees/layer_tree_host_unittest_delegated.cc
@@ -342,9 +342,10 @@ class LayerTreeHostDelegatedTestCreateChildId
         EXPECT_TRUE(delegated_impl->ChildId());
         EXPECT_FALSE(did_reset_child_id_);
 
-        context_provider->Context3d()->loseContextCHROMIUM(
+        context_provider->ContextGL()->LoseContextCHROMIUM(
             GL_GUILTY_CONTEXT_RESET_ARB,
             GL_INNOCENT_CONTEXT_RESET_ARB);
+        context_provider->ContextGL()->Flush();
         break;
       case 3:
         EXPECT_TRUE(delegated_impl->ChildId());
@@ -419,7 +420,7 @@ class LayerTreeHostDelegatedTestInvalidFrameAfterContextLost
     ++num_activates_;
     switch (num_activates_) {
       case 2:
-        context_provider->Context3d()->loseContextCHROMIUM(
+        context_provider->ContextGL()->LoseContextCHROMIUM(
             GL_GUILTY_CONTEXT_RESET_ARB,
             GL_INNOCENT_CONTEXT_RESET_ARB);
         break;