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 5a33fdc008bd22d9391ba8c815f0b2b8575388c7..dd65b7921550aecca6e56f0f24ca2981ed7afcc9 100644
--- a/cc/trees/layer_tree_host_unittest_delegated.cc
+++ b/cc/trees/layer_tree_host_unittest_delegated.cc
@@ -343,9 +343,10 @@ class LayerTreeHostDelegatedTestCreateChildId
         EXPECT_TRUE(delegated_impl->ChildId());
         EXPECT_FALSE(did_reset_child_id_);
 
-        context_provider->TestContext3d()->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());
@@ -420,7 +421,7 @@ class LayerTreeHostDelegatedTestInvalidFrameAfterContextLost
     ++num_activates_;
     switch (num_activates_) {
       case 2:
-        context_provider->TestContext3d()->loseContextCHROMIUM(
+        context_provider->ContextGL()->LoseContextCHROMIUM(
             GL_GUILTY_CONTEXT_RESET_ARB,
             GL_INNOCENT_CONTEXT_RESET_ARB);
         break;