Move the ViewType enum to extensions\common.

chrome/browser/extensions/extension_host_mac.mm

Index: chrome/browser/extensions/extension_host_mac.mm
===================================================================
--- chrome/browser/extensions/extension_host_mac.mm	(revision 191609)
+++ chrome/browser/extensions/extension_host_mac.mm	(working copy)
@@ -7,7 +7,6 @@
 #import "chrome/browser/ui/cocoa/chrome_event_processing_window.h"
 #import "chrome/browser/ui/cocoa/extensions/extension_popup_controller.h"
 #import "chrome/browser/ui/cocoa/info_bubble_window.h"
-#include "chrome/common/view_type.h"
 #include "content/public/browser/native_web_keyboard_event.h"
 
 using content::NativeWebKeyboardEvent;
@@ -29,7 +28,7 @@
     content::WebContents* source,
     const NativeWebKeyboardEvent& event) {
   if (event.skip_in_browser || event.type == NativeWebKeyboardEvent::Char ||
-      extension_host_type() != chrome::VIEW_TYPE_EXTENSION_POPUP) {
+      extension_host_type() != VIEW_TYPE_EXTENSION_POPUP) {
     return;
   }