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

chrome/browser/cocoa/autocomplete_text_field.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.h"
 
 #include "base/logging.h"
 #import "chrome/browser/cocoa/autocomplete_text_field_cell.h"
 #import "chrome/browser/cocoa/browser_window_controller.h"
 #import "chrome/browser/cocoa/toolbar_controller.h"
 #import "chrome/browser/cocoa/url_drop_target.h"
 
 @implementation AutocompleteTextField
 
 @synthesize observer = observer_;
 
 + (Class)cellClass {
   return [AutocompleteTextFieldCell class];
 }
 
 - (void)dealloc {
   [[NSNotificationCenter defaultCenter] removeObserver:self];
   [super dealloc];
 }
 
 - (void)awakeFromNib {
   DCHECK([[self cell] isKindOfClass:[AutocompleteTextFieldCell class]]);
-  dropHandler_.reset([[URLDropTargetHandler alloc] initWithView:self]);
   currentToolTips_.reset([[NSMutableArray alloc] init]);
 }
 
 - (void)flagsChanged:(NSEvent*)theEvent {
   if (observer_) {
     const bool controlFlag = ([theEvent modifierFlags]&NSControlKeyMask) != 0;
     observer_->OnControlKeyChanged(controlFlag);
   }
 }
 
@@ skipping 258 matching lines @@
   }
 }
 
 - (void)viewDidMoveToWindow {
   if ([self window]) {
     NSNotificationCenter* nc = [NSNotificationCenter defaultCenter];
     [nc addObserver:self
            selector:@selector(windowDidResignKey:)
                name:NSWindowDidResignKeyNotification
              object:[self window]];
+    // Only register for drops if not in a popup window. Lazily create the
+    // drop handler when the type of window is known.
+    BrowserWindowController* windowController =
+        [BrowserWindowController browserWindowControllerForView:self];
+    if ([windowController isNormalWindow])
+      dropHandler_.reset([[URLDropTargetHandler alloc] initWithView:self]);
   }
 }
 
 // (Overridden from NSResponder)
 - (BOOL)becomeFirstResponder {
   BOOL doAccept = [super becomeFirstResponder];
   if (doAccept) {
     [[BrowserWindowController browserWindowControllerForView:self]
         lockBarVisibilityForOwner:self withAnimation:YES delay:NO];
   }
   return doAccept;
 }
 
 // (Overridden from NSResponder)
 - (BOOL)resignFirstResponder {
   BOOL doResign = [super resignFirstResponder];
   if (doResign) {
     [[BrowserWindowController browserWindowControllerForView:self]
         releaseBarVisibilityForOwner:self 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, which will select the text to indicate
   // that our contents would be replaced by a drop.
   // TODO(viettrungluu): crbug.com/30809 -- this is a hack since it steals focus
   // and doesn't return it.
   [[self window] makeFirstResponder:self];
   return [dropHandler_ draggingEntered:sender];
 }
 
 // (URLDropTarget protocol)
 - (NSDragOperation)draggingUpdated:(id<NSDraggingInfo>)sender {
   return [dropHandler_ draggingUpdated:sender];
 }
 
 // (URLDropTarget protocol)
 - (void)draggingExited:(id<NSDraggingInfo>)sender {
   return [dropHandler_ draggingExited:sender];
 }
 
 // (URLDropTarget protocol)
 - (BOOL)performDragOperation:(id<NSDraggingInfo>)sender {
   return [dropHandler_ performDragOperation:sender];
 }
 
 @end