Don't allow drops on the omnibox for popup windows....

chrome/browser/cocoa/autocomplete_text_field_editor.mm

 // Copyright (c) 2010 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/cocoa/autocomplete_text_field_editor.h"
 
 #include "app/l10n_util_mac.h"
 #include "base/string_util.h"
 #include "grit/generated_resources.h"
 #include "base/sys_string_conversions.h"
@@ skipping 171 matching lines @@
     DCHECK([field isKindOfClass:[AutocompleteTextField class]]);
     // Give the text field ownership of the visibility lock.
     [[BrowserWindowController browserWindowControllerForView:field]
         releaseBarVisibilityForOwner:field withAnimation:YES delay:YES];
   }
   return doResign;
 }
 
 // (URLDropTarget protocol)
 - (id<URLDropTargetController>)urlDropController {
-  BrowserWindowController* windowController = [[self window] windowController];
-  DCHECK([windowController isKindOfClass:[BrowserWindowController class]]);
+  BrowserWindowController* windowController =
+      [BrowserWindowController browserWindowControllerForView:self];
   return [windowController toolbarController];
 }
 
 // (URLDropTarget protocol)
 - (NSDragOperation)draggingEntered:(id<NSDraggingInfo>)sender {
   // Make ourself the first responder (even though we're presumably already the
   // first responder), which will select the text to indicate that our contents
   // would be replaced by a drop.
   [[self window] makeFirstResponder:self];
   return [dropHandler_ draggingEntered:sender];
@@ skipping 37 matching lines @@
 
   // TODO(shess): Beep on empty?  I hate beeps, though.
   // NOTE: If |aString| is empty, this intentionally replaces the
   // selection with empty.  This seems consistent with the case where
   // the input contained a mixture of characters and the string ended
   // up not empty.
   [super insertText:aString];
 }
 
 @end