Convert main_render_frame_ to raw pointer in RenderViewImpl.

content/renderer/render_view_browsertest.cc

Index: content/renderer/render_view_browsertest.cc
diff --git a/content/renderer/render_view_browsertest.cc b/content/renderer/render_view_browsertest.cc
index 13d09524911be29b1e190bccc2b86e2f32f22e39..d43f3e5f90b487e1a622a1fe6024f1d63dd2f4a5 100644
--- a/content/renderer/render_view_browsertest.cc
+++ b/content/renderer/render_view_browsertest.cc
@@ -376,17 +376,12 @@ TEST_F(RenderViewImplTest, RenderFrameMessageAfterDetach) {
       GetMainFrame(), popup_request, blink::WebWindowFeatures(), "foo",
       blink::WebNavigationPolicyNewForegroundTab, false);
   RenderViewImpl* new_view = RenderViewImpl::FromWebView(new_web_view);
-  RenderFrameImpl* new_frame =
-      static_cast<RenderFrameImpl*>(new_view->GetMainRenderFrame());
 
   // Detach the main frame.
   new_view->Close();
 
-  // Before the frame is asynchronously deleted, it may receive a message.
-  // We should not crash here, and the message should not be processed.
-  scoped_ptr<const IPC::Message> msg(
-      new FrameMsg_Stop(frame()->GetRoutingID()));
-  EXPECT_FALSE(new_frame->OnMessageReceived(*msg));
+  // Deleted RenderFrame cannot receive IPCs.
+  EXPECT_FALSE(new_view->GetMainRenderFrame());
 
   // Clean up after the new view so we don't leak it.
   new_view->Release();
@@ -2014,7 +2009,7 @@ TEST_F(RenderViewImplTest, NavigateSubframe) {
 // This test ensures that a RenderFrame object is created for the top level
 // frame in the RenderView.
 TEST_F(RenderViewImplTest, BasicRenderFrame) {
-  EXPECT_TRUE(view()->main_render_frame_.get());
+  EXPECT_TRUE(view()->main_render_frame_);
 }
 
 TEST_F(RenderViewImplTest, GetSSLStatusOfFrame) {