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

content/browser/frame_host/navigator_impl_unittest.cc

Index: content/browser/frame_host/navigator_impl_unittest.cc
diff --git a/content/browser/frame_host/navigator_impl_unittest.cc b/content/browser/frame_host/navigator_impl_unittest.cc
index f8069f526fb74391a0d02ab6efb8e9ed30a98633..39e814a34f74565891f3e8fc8563bc7fbc33b93f 100644
--- a/content/browser/frame_host/navigator_impl_unittest.cc
+++ b/content/browser/frame_host/navigator_impl_unittest.cc
@@ -84,12 +84,10 @@ class NavigatorTestWithBrowserSideNavigation
   // Note: caller must invoke ClearMessages on the sink at some point before
   // the tracked commit happens to clear up commit messages from previous
   // navigations.
-  bool DidRenderFrameHostRequestCommit(RenderFrameHostImpl* rfh) {
-    MockRenderProcessHost* rph =
-        static_cast<MockRenderProcessHost*>(rfh->GetProcess());
+  bool DidRenderFrameHostRequestCommit(TestRenderFrameHost* rfh) {
     const FrameMsg_CommitNavigation* commit_message =
         static_cast<const FrameMsg_CommitNavigation*>(
-            rph->sink().GetUniqueMessageMatching(
+            rfh->GetProcess()->sink().GetUniqueMessageMatching(
                 FrameMsg_CommitNavigation::ID));
     return commit_message &&
            rfh->GetRoutingID() == commit_message->routing_id();
@@ -938,9 +936,7 @@ TEST_F(NavigatorTestWithBrowserSideNavigation,
   // Now go back to the initial site so that the swapped out RenderFrameHost
   // should be reused.
   process()->sink().ClearMessages();
-  static_cast<MockRenderProcessHost*>(rfh1->GetProcess())
-      ->sink()
-      .ClearMessages();
+  rfh1->GetProcess()->sink().ClearMessages();
   RequestNavigation(node, kUrl1);
   EXPECT_FALSE(GetSpeculativeRenderFrameHost(node));