Small C++11 clean-up in web modal dialogs.

BUG=none
TBR=wittman@chromium.org

Change-Id: If60be20e1ef4e59838be04821eec0b30eba4d2be
Reviewed-on: https://chromium-review.googlesource.com/1252242Reviewed-by: Leonard Grey <lgrey@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595172}

components/web_modal/web_contents_modal_dialog_manager.cc

@@ -61,11 +61,10 @@ content::WebContents* WebContentsModalDialogManager::GetWebContents() const {
 }
 
 void WebContentsModalDialogManager::WillClose(gfx::NativeWindow dialog) {
-  WebContentsModalDialogList::iterator dlg =
-      std::find_if(child_dialogs_.begin(), child_dialogs_.end(),
-                   [dialog](const DialogState& child_dialog) {
-                     return child_dialog.dialog == dialog;
-                   });
+  auto dlg = std::find_if(child_dialogs_.begin(), child_dialogs_.end(),
+                          [dialog](const DialogState& child_dialog) {
+                            return child_dialog.dialog == dialog;
+                          });
 
   // The Views tab contents modal dialog calls WillClose twice.  Ignore the
   // second invocation.

components/web_modal/web_contents_modal_dialog_manager.h

@@ -82,8 +82,6 @@ class WebContentsModalDialogManager
     std::unique_ptr<SingleWebContentsDialogManager> manager;
   };
 
-  using WebContentsModalDialogList = base::circular_deque<DialogState>;
-
   // Blocks/unblocks interaction with renderer process.
   void BlockWebContentsInteraction(bool blocked);
 
@@ -101,7 +99,7 @@ class WebContentsModalDialogManager
   WebContentsModalDialogManagerDelegate* delegate_;
 
   // All active dialogs.
-  WebContentsModalDialogList child_dialogs_;
+  base::circular_deque<DialogState> child_dialogs_;
 
   // Whether the WebContents' visibility is content::Visibility::HIDDEN.
   bool web_contents_is_hidden_;