Allow MimeHandlerViewGuest to be notified of StopFinding events.

extensions/browser/guest_view/web_view/web_view_guest.cc

Index: extensions/browser/guest_view/web_view/web_view_guest.cc
diff --git a/extensions/browser/guest_view/web_view/web_view_guest.cc b/extensions/browser/guest_view/web_view/web_view_guest.cc
index e9c25ba23e1afb1c42174ed948b7be2d1647e083..1503a8f998001085f01298f5a184b8a98d756bf9 100644
--- a/extensions/browser/guest_view/web_view/web_view_guest.cc
+++ b/extensions/browser/guest_view/web_view/web_view_guest.cc
@@ -556,14 +556,14 @@ void WebViewGuest::Observe(int type,
   }
 }
 
-void WebViewGuest::StartFinding(
+void WebViewGuest::StartFindInternal(
     const base::string16& search_text,
     const blink::WebFindOptions& options,
     scoped_refptr<WebViewInternalFindFunction> find_function) {
   find_helper_.Find(web_contents(), search_text, options, find_function);
 }
 
-void WebViewGuest::StopFinding(content::StopFindAction action) {
+void WebViewGuest::StopFindingInternal(content::StopFindAction action) {
   find_helper_.CancelAllFindSessions();
   web_contents()->StopFinding(action);
 }