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

content/browser/frame_host/navigation_controller_impl_unittest.cc

Index: content/browser/frame_host/navigation_controller_impl_unittest.cc
diff --git a/content/browser/frame_host/navigation_controller_impl_unittest.cc b/content/browser/frame_host/navigation_controller_impl_unittest.cc
index c1fce3c30fec4e115e8f926bf45b66b0ef7033ca..b0eeabb4ecd097dd2edc71ab08eb69059ba30b00 100644
--- a/content/browser/frame_host/navigation_controller_impl_unittest.cc
+++ b/content/browser/frame_host/navigation_controller_impl_unittest.cc
@@ -3308,8 +3308,7 @@ TEST_F(NavigationControllerTest, IsInPageNavigation) {
 
   // Test allow_universal_access_from_file_urls flag.
   const GURL different_origin_url("http://www.example.com");
-  MockRenderProcessHost* rph =
-      static_cast<MockRenderProcessHost*>(main_test_rfh()->GetProcess());
+  MockRenderProcessHost* rph = main_test_rfh()->GetProcess();
   WebPreferences prefs = test_rvh()->GetWebkitPreferences();
   prefs.allow_universal_access_from_file_urls = true;
   test_rvh()->UpdateWebkitPreferences(prefs);