Remove usages of WebContents::GetRenderViewHost().

This CL was uploaded by git cl split.

R=szager@chromium.org

Bug: 1142671
Change-Id: I38de99a1ea146247a0a9e7a6f75eb4826a2cdf72
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2500217
Auto-Submit: Lucas Gadani <lfg@chromium.org>
Reviewed-by: Stefan Zager <szager@chromium.org>
Commit-Queue: Stefan Zager <szager@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822724}

content/renderer/dom_serializer_browsertest.cc

@@ -86,8 +86,11 @@ class MAYBE_DomSerializerTests : public ContentBrowserTest,
   }
 
   void SetUpOnMainThread() override {
-    render_view_routing_id_ =
-        shell()->web_contents()->GetRenderViewHost()->GetRoutingID();
+    render_view_routing_id_ = shell()
+                                  ->web_contents()
+                                  ->GetMainFrame()
+                                  ->GetRenderViewHost()
+                                  ->GetRoutingID();
   }
 
   // DomSerializerDelegate.
@@ -136,8 +139,11 @@ class MAYBE_DomSerializerTests : public ContentBrowserTest,
     navigation_observer.Wait();
     // After navigations, the RenderView for the new document might be a new
     // one.
-    render_view_routing_id_ =
-        shell()->web_contents()->GetRenderViewHost()->GetRoutingID();
+    render_view_routing_id_ = shell()
+                                  ->web_contents()
+                                  ->GetMainFrame()
+                                  ->GetRenderViewHost()
+                                  ->GetRoutingID();
   }
 
   class SingleLinkRewritingDelegate

content/renderer/visual_state_browsertest.cc

@@ -105,8 +105,11 @@ IN_PROC_BROWSER_TEST_F(VisualStateTest, DISABLED_CallbackDoesNotDeadlock) {
   // with a high level of confidence if we used a timeout, but that's
   // discouraged (see https://codereview.chromium.org/939673002).
   EXPECT_TRUE(NavigateToURL(shell(), GURL("about:blank")));
-  CommitObserver observer(RenderView::FromRoutingID(
-      shell()->web_contents()->GetRenderViewHost()->GetRoutingID()));
+  CommitObserver observer(RenderView::FromRoutingID(shell()
+                                                        ->web_contents()
+                                                        ->GetMainFrame()
+                                                        ->GetRenderViewHost()
+                                                        ->GetRoutingID()));
 
   // Wait for the commit corresponding to the load.