Mac: Fix a crash on "Look Up in Dictionary" context menu.

chrome/browser/tab_contents/render_view_context_menu_mac.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.
 
 #include "chrome/browser/tab_contents/render_view_context_menu_mac.h"
 
 #include "base/compiler_specific.h"
 #include "base/message_loop.h"
 #include "base/scoped_nsobject.h"
 #include "base/sys_string_conversions.h"
@@ skipping 59 matching lines @@
   }
 
 }
 
 void RenderViewContextMenuMac::LookUpInDictionary() {
   // TODO(morrita): On Safari, A dictionary panel could be shown
   // based on a preference setting of Dictionary.app.  We currently
   // don't support it: http://crbug.com/17951
   NSString* text = base::SysWideToNSString(params_.selection_text);
   NSPasteboard* pboard = [NSPasteboard pasteboardWithUniqueName];
+  // 10.5 and earlier require declareTypes before setData.
+  // See the documentation on [NSPasteboard declareTypes].
+  NSArray* toDeclare = [NSArray arrayWithObject:NSStringPboardType];
+  [pboard declareTypes:toDeclare owner:nil];
   BOOL ok = [pboard setString:text forType:NSStringPboardType];
   if (ok)
     NSPerformService(@"Look Up in Dictionary", pboard);
 }