DevTools: migrate DevTools APIs to use WebContents instead of RenderViewHost.

chrome/browser/prerender/prerender_browsertest.cc

Index: chrome/browser/prerender/prerender_browsertest.cc
diff --git a/chrome/browser/prerender/prerender_browsertest.cc b/chrome/browser/prerender/prerender_browsertest.cc
index 517ae76aac3c3bd038baa641340f63bac33e85fe..e4abbdb053298893e93affbf32f52fd535daccf0 100644
--- a/chrome/browser/prerender/prerender_browsertest.cc
+++ b/chrome/browser/prerender/prerender_browsertest.cc
@@ -3296,7 +3296,7 @@ IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest,
   WebContents* web_contents =
       current_browser()->tab_strip_model()->GetActiveWebContents();
   scoped_refptr<DevToolsAgentHost> agent(DevToolsAgentHost::GetOrCreateFor(
-      web_contents->GetRenderViewHost()));
+      web_contents));
   DevToolsManager* manager = DevToolsManager::GetInstance();
   FakeDevToolsClientHost client_host;
   manager->RegisterDevToolsClientHostFor(agent.get(), &client_host);