Get rid of the RenderViewType concept in content, since it was only used by Chrome. Store the enum…

chrome/browser/extensions/api/web_navigation/web_navigation_api.cc

Index: chrome/browser/extensions/api/web_navigation/web_navigation_api.cc
===================================================================
--- chrome/browser/extensions/api/web_navigation/web_navigation_api.cc	(revision 138369)
+++ chrome/browser/extensions/api/web_navigation/web_navigation_api.cc	(working copy)
@@ -447,7 +447,7 @@
   if (!tab_observer) {
     // If you hit this DCHECK(), please add reproduction steps to
     // http://crbug.com/109464.
-    DCHECK(details->source_web_contents->GetViewType() !=
+    DCHECK(chrome::GetViewType(details->source_web_contents) !=
            chrome::VIEW_TYPE_TAB_CONTENTS);
     return;
   }