[Mac] Make the Confirm to Quit floaty panel a singleton so multiple panels do not appear.

BUG=61815
TEST=With the confirm-to-quit lab enabled, mash Cmd+Q. Only 1 floaty window appears.

Review URL: http://codereview.chromium.org/5255001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@67001 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 2 insertions, 4 deletions

diff --git a/chrome/browser/app_controller_mac.mm b/chrome/browser/app_controller_mac.mm
index edb15d6..9a5052e 100644
--- a/chrome/browser/app_controller_mac.mm
+++ b/chrome/browser/app_controller_mac.mm
@@ -295,10 +295,8 @@ void RecordLastRunAppBundlePath() {
   // http://dev.chromium.org/developers/design-documents/confirm-to-quit-experiment
   NSEvent* currentEvent = [app currentEvent];
   if ([currentEvent type] == NSKeyDown) {
-    ConfirmQuitPanelController* quitPanel =
-        [[ConfirmQuitPanelController alloc] init];  // Releases self.
     // Show the info panel that explains what the user must to do confirm quit.
-    [quitPanel showWindow:self];
+    [[ConfirmQuitPanelController sharedController] showWindow:self];
 
     // How long the user must hold down Cmd+Q to confirm the quit.
     const NSTimeInterval kTimeToConfirmQuit = 1.5;
@@ -361,7 +359,7 @@ void RecordLastRunAppBundlePath() {
     } else {
       // Slowly fade the confirm window out in case the user doesn't
       // understand what they have to do to quit.
-      [quitPanel dismissPanel];
+      [[ConfirmQuitPanelController sharedController] dismissPanel];
       return NSTerminateCancel;
     }
   }  // if event type is KeyDown