Windowed mode mouse lock addded to fullscreen controller.

chrome/browser/ui/cocoa/browser_window_controller_private.mm

Index: chrome/browser/ui/cocoa/browser_window_controller_private.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_controller_private.mm b/chrome/browser/ui/cocoa/browser_window_controller_private.mm
index 75362f94f1402faaed78a7cbb78bf07d25771ad2..9835cf3561501c7db711f9e9d49243b0bd090bd8 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller_private.mm
+++ b/chrome/browser/ui/cocoa/browser_window_controller_private.mm
@@ -789,23 +789,15 @@ willPositionSheet:(NSWindow*)sheet
 }
 
 - (void)showFullscreenExitBubbleIfNecessary {
-  if (!browser_->IsFullscreenForTabOrPending()) {
-    return;
-  }
-
   [presentationModeController_ ensureOverlayHiddenWithAnimation:NO delay:NO];
 
+  [fullscreenExitBubbleController_ closeImmediately];
   fullscreenExitBubbleController_.reset(
       [[FullscreenExitBubbleController alloc]
           initWithOwner:self
                 browser:browser_.get()
                     url:fullscreenUrl_
              bubbleType:fullscreenBubbleType_]);
-  NSView* contentView = [[self window] contentView];
-  CGFloat maxWidth = NSWidth([contentView frame]);
-  CGFloat maxY = NSMaxY([[[self window] contentView] frame]);
-  [fullscreenExitBubbleController_
-      positionInWindowAtTop:maxY width:maxWidth];
   [fullscreenExitBubbleController_ showWindow];
 }