Move enum MenuAnchorPosition to reduce deps on menu_item_view.h

chrome/browser/ui/views/location_bar/page_action_image_view.cc

Index: chrome/browser/ui/views/location_bar/page_action_image_view.cc
diff --git a/chrome/browser/ui/views/location_bar/page_action_image_view.cc b/chrome/browser/ui/views/location_bar/page_action_image_view.cc
index fc77014685a67aa2bfc0773a6adb00b6380f930e..cfb05e3234e705038106c228237756533f68338a 100644
--- a/chrome/browser/ui/views/location_bar/page_action_image_view.cc
+++ b/chrome/browser/ui/views/location_bar/page_action_image_view.cc
@@ -26,7 +26,6 @@
 #include "ui/events/event.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/image/image.h"
-#include "ui/views/controls/menu/menu_item_view.h"
 #include "ui/views/controls/menu/menu_runner.h"
 
 using content::WebContents;
@@ -160,11 +159,16 @@ void PageActionImageView::ShowContextMenuForView(
   menu_runner_.reset(new views::MenuRunner(context_menu_model.get()));
   gfx::Point screen_loc;
   views::View::ConvertPointToScreen(this, &screen_loc);
-  if (menu_runner_->RunMenuAt(GetWidget(), NULL, gfx::Rect(screen_loc, size()),
-          views::MenuItemView::TOPLEFT, source_type,
+  if (menu_runner_->RunMenuAt(
+          GetWidget(),
+          NULL,
+          gfx::Rect(screen_loc, size()),
+          views::MENU_ANCHOR_TOPLEFT,
+          source_type,
           views::MenuRunner::HAS_MNEMONICS | views::MenuRunner::CONTEXT_MENU) ==
-      views::MenuRunner::MENU_DELETED)
+      views::MenuRunner::MENU_DELETED) {
     return;
+  }
 }
 
 bool PageActionImageView::AcceleratorPressed(