Moving extension code out of "components/" to avoid layering violations.

chrome/browser/guest_view/web_view/context_menu_content_type_web_view.h

Index: chrome/browser/guest_view/web_view/context_menu_content_type_web_view.h
diff --git a/chrome/browser/guest_view/web_view/context_menu_content_type_web_view.h b/chrome/browser/guest_view/web_view/context_menu_content_type_web_view.h
index 0652fdd1ef83cc87341ddae3e74b89ebe86b6d6b..d41249816418c7947636167cd592dfc55995c0f2 100644
--- a/chrome/browser/guest_view/web_view/context_menu_content_type_web_view.h
+++ b/chrome/browser/guest_view/web_view/context_menu_content_type_web_view.h
@@ -7,6 +7,10 @@
 
 #include "components/renderer_context_menu/context_menu_content_type.h"
 
+namespace extensions {
+class Extension;
+}
+
 // A ContextMenuContentType for <webview> guest.
 // Guests are rendered inside chrome apps, but have most of the actions
 // that a regular web page has. Currently actions/items that are suppressed from
@@ -25,6 +29,8 @@ class ContextMenuContentTypeWebView : public ContextMenuContentType {
  private:
   friend class ContextMenuContentTypeFactory;
 
+  const extensions::Extension* GetExtension() const;
+
   DISALLOW_COPY_AND_ASSIGN(ContextMenuContentTypeWebView);
 };