Remove usages of WebContents::GetRenderViewHost().

This CL was uploaded by git cl split.

R=engedy@chromium.org

Bug: 1142671
Change-Id: Iaad90fd28073bddc82dc6e318889c2c6114e1b59
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2500555
Auto-Submit: Lucas Gadani <lfg@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Commit-Queue: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821190}

chrome/browser/permissions/permission_request_manager_browsertest.cc

@@ -941,8 +941,11 @@ IN_PROC_BROWSER_TEST_F(
   ASSERT_TRUE(VerifyUi());
 
   // Simulate a render process crash while the permission prompt is pending.
-  content::RenderViewHost* render_view_host =
-      browser()->tab_strip_model()->GetActiveWebContents()->GetRenderViewHost();
+  content::RenderViewHost* render_view_host = browser()
+                                                  ->tab_strip_model()
+                                                  ->GetActiveWebContents()
+                                                  ->GetMainFrame()
+                                                  ->GetRenderViewHost();
   content::RenderProcessHost* render_process_host =
       render_view_host->GetProcess();
   content::RenderProcessHostWatcher crash_observer(