Remove unnecessary "extensions::" prefix in guest_view/web_view/app_view directories.

chrome/browser/guest_view/web_view/web_view_find_helper.h

Index: chrome/browser/guest_view/web_view/web_view_find_helper.h
diff --git a/chrome/browser/guest_view/web_view/web_view_find_helper.h b/chrome/browser/guest_view/web_view/web_view_find_helper.h
index eac5ab8aea318a3a61ae1b19630a1ca9cacd3dc9..b257a727ee903736996c7eb2e6c1ce103b12f834 100644
--- a/chrome/browser/guest_view/web_view/web_view_find_helper.h
+++ b/chrome/browser/guest_view/web_view/web_view_find_helper.h
@@ -40,7 +40,7 @@ class WebViewFindHelper {
       content::WebContents* guest_web_contents,
       const base::string16& search_text,
       const blink::WebFindOptions& options,
-      scoped_refptr<extensions::WebViewInternalFindFunction> find_function);
+      scoped_refptr<WebViewInternalFindFunction> find_function);
 
   // Helper function for WeViewGuest:FindReply().
   void FindReply(int request_id,
@@ -105,7 +105,7 @@ class WebViewFindHelper {
         int request_id,
         const base::string16& search_text,
         const blink::WebFindOptions& options,
-        scoped_refptr<extensions::WebViewInternalFindFunction> find_function);
+        scoped_refptr<WebViewInternalFindFunction> find_function);
     ~FindInfo();
 
     // Add another request to |find_next_requests_|.
@@ -145,7 +145,7 @@ class WebViewFindHelper {
     const int request_id_;
     const base::string16 search_text_;
     blink::WebFindOptions options_;
-    scoped_refptr<extensions::WebViewInternalFindFunction> find_function_;
+    scoped_refptr<WebViewInternalFindFunction> find_function_;
     FindResults find_results_;
 
     // A find reply has been received for this find request.