Request focus for re-auth webview.

Request focus for re-auth webview after re-auth dialog is showing.

BUG=520046.

Review URL: https://codereview.chromium.org/1336853003

Cr-Commit-Position: refs/heads/master@{#348789}

chrome/browser/ui/views/profiles/user_manager_view.cc

@@ -75,6 +75,7 @@ class ReauthDelegate : public views::DialogDelegateView,
   void DeleteDelegate() override;
   base::string16 GetWindowTitle() const override;
   int GetDialogButtons() const override;
+  views::View* GetInitiallyFocusedView() override;
 
   // UserManager::ReauthObserver:
   void CloseReauthDialog() override;
@@ -138,6 +139,10 @@ int ReauthDelegate::GetDialogButtons() const {
   return ui::DIALOG_BUTTON_NONE;
 }
 
+views::View* ReauthDelegate::GetInitiallyFocusedView() {
+  return static_cast<views::View*>(web_view_);
+}
+
 void ReauthDelegate::CloseReauthDialog() {
   GetWidget()->Close();
 }