Fix constrained window position for inactive tab

chrome/browser/ui/cocoa/constrained_window/constrained_window_sheet_controller.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/cocoa/constrained_window/constrained_window_sheet_controller.h"
 
 #include <map>
 
 #include "base/logging.h"
 #include "chrome/browser/ui/cocoa/constrained_window/constrained_window_animation.h"
@@ skipping 164 matching lines @@
         [[ConstrainedWindowAnimationHide alloc] initWithWindow:sheet]);
     [animation startAnimation];
   }
 
   [self closeSheetWithoutAnimation:info];
 }
 
 - (void)parentViewDidBecomeActive:(NSView*)parentView {
   [[self findSheetInfoForParentView:activeView_] hideSheet];
   activeView_.reset([parentView retain]);
+  [self updateSheetPosition:parentView];
   [[self findSheetInfoForParentView:activeView_] showSheet];
 }
 
 - (void)pulseSheet:(NSWindow*)sheet {
   ConstrainedWindowSheetInfo* info = [self findSheetInfoForSheet:sheet];
   DCHECK(info);
   if (![activeView_ isEqual:[info parentView]])
     return;
 
   scoped_nsobject<NSAnimation> animation(
@@ skipping 34 matching lines @@
 
   // Delete this instance.
   [g_sheetControllers removeObjectForKey:GetKeyForParentWindow(parentWindow_)];
   if (![g_sheetControllers count]) {
     [g_sheetControllers release];
     g_sheetControllers = nil;
   }
 }
 
 - (void)onParentViewFrameDidChange:(NSNotification*)note {
-  [self updateSheetPosition:[note object]];
+  NSView* parentView = [note object];
+  if (![activeView_ isEqual:parentView])
+    return;
+  [self updateSheetPosition:parentView];
 }
 
 - (void)updateSheetPosition:(NSView*)parentView {
-  if (![activeView_ isEqual:parentView])
-    return;
   ConstrainedWindowSheetInfo* info =
       [self findSheetInfoForParentView:parentView];
-  DCHECK(info);
+  if (!info)
+    return;
+
   NSRect rect = [self overlayWindowFrameForParentView:parentView];
   [[info overlayWindow] setFrame:rect display:YES];
   NSPoint origin = [self originForSheetSize:[[info sheet] frame].size
                             inContainerRect:rect];
   [[info sheet] setFrameOrigin:origin];
 }
 
 - (NSRect)overlayWindowFrameForParentView:(NSView*)parentView {
   NSRect viewFrame = [parentView convertRect:[parentView bounds] toView:nil];
   viewFrame.origin = [[parentView window] convertBaseToScreen:viewFrame.origin];
@@ skipping 29 matching lines @@
               object:[info parentView]];
 
   [parentWindow_ removeChildWindow:[info overlayWindow]];
   [[info overlayWindow] removeChildWindow:[info sheet]];
   [[info sheet] close];
   [[info overlayWindow] close];
   [sheets_ removeObject:info];
 }
 
 @end