Mac: Sheets should be positioned between the content and everything above it.

chrome/browser/cocoa/browser_window_controller.mm

 // Copyright (c) 2009 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.
 
 #include <Carbon/Carbon.h>
 
 #include "base/mac_util.h"
 #include "base/scoped_nsdisable_screen_updates.h"
 #import "base/scoped_nsobject.h"
 #include "base/sys_string_conversions.h"
@@ skipping 1137 matching lines @@
   windowPreferences->SetInteger(L"top", bounds.y());
   windowPreferences->SetInteger(L"right", bounds.right());
   windowPreferences->SetInteger(L"bottom", bounds.bottom());
   windowPreferences->SetBoolean(L"maximized", false);
   windowPreferences->SetBoolean(L"always_on_top", false);
 }
 
 - (NSRect)window:(NSWindow*)window
 willPositionSheet:(NSWindow*)sheet
        usingRect:(NSRect)defaultSheetRect {
-  NSRect windowFrame = [window frame];
-  defaultSheetRect.origin.y = windowFrame.size.height - 10;
+  // Any sheet should come from right above the visible content area.
+  NSRect toolbarFrame = [[toolbarController_ view] frame];
+  NSRect infobarFrame = [[infoBarContainerController_ view] frame];
+  defaultSheetRect.origin.y = toolbarFrame.origin.y - infobarFrame.size.height;
+
   return defaultSheetRect;
 }
 
 // In addition to the tab strip and content area, which the superview's impl
 // takes care of, we need to add the toolbar and bookmark bar to the
 // overlay so they draw correctly when dragging out a new window.
 - (NSArray*)viewsToMoveToOverlay {
   NSArray* views = [super viewsToMoveToOverlay];
   NSArray* browserViews =
       [NSArray arrayWithObjects:[toolbarController_ view],
@@ skipping 247 matching lines @@
       provider->GetNSColor(BrowserThemeProvider::COLOR_TOOLBAR);
   [theme setValue:toolbarBackgroundColor
      forAttribute:@"backgroundColor"
             style:GTMThemeStyleToolBar
             state:GTMThemeStateActiveWindow];
 
   return theme;
 }
 @end