Add covariant overrides to TestRVH::GetProcess and TestRFH::GetProcess

content/test/test_render_frame_host.cc

Index: content/test/test_render_frame_host.cc
diff --git a/content/test/test_render_frame_host.cc b/content/test/test_render_frame_host.cc
index 93bc602599602e5a8ce517628c914dc2b1c966c9..f38d13949c082b69c2095de0b407e248cd240b43 100644
--- a/content/test/test_render_frame_host.cc
+++ b/content/test/test_render_frame_host.cc
@@ -67,6 +67,10 @@ TestRenderViewHost* TestRenderFrameHost::GetRenderViewHost() {
       RenderFrameHostImpl::GetRenderViewHost());
 }
 
+MockRenderProcessHost* TestRenderFrameHost::GetProcess() {
+  return static_cast<MockRenderProcessHost*>(RenderFrameHostImpl::GetProcess());
+}
+
 TestRenderFrameHost* TestRenderFrameHost::AppendChild(
     const std::string& frame_name) {
   OnCreateChildFrame(GetProcess()->GetNextRoutingID(), frame_name,