Change how ui::Clipboard is accessed so there's only one per thread.

ui/views/controls/textfield/native_textfield_win.cc

 // 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.
 
 #include "ui/views/controls/textfield/native_textfield_win.h"
 
 #include <algorithm>
 
 #include "base/i18n/case_conversion.h"
 #include "base/i18n/rtl.h"
@@ skipping 541 matching lines @@
       MenuRunner::HAS_MNEMONICS));
 }
 
 void NativeTextfieldWin::OnCopy() {
   if (textfield_->IsObscured())
     return;
 
   const string16 text(GetSelectedText());
   if (!text.empty() && ViewsDelegate::views_delegate) {
     ui::ScopedClipboardWriter scw(
-        ViewsDelegate::views_delegate->GetClipboard(),
+        ui::Clipboard::GetForCurrentThread(),
         ui::Clipboard::BUFFER_STANDARD);
     scw.WriteText(text);
   }
 }
 
 void NativeTextfieldWin::OnCut() {
   if (textfield_->read_only() || textfield_->IsObscured())
     return;
 
   OnCopy();
@@ skipping 386 matching lines @@
   // x-buttons (which usually means "thumb buttons") are pressed, so we only
   // call this for M and R down.
   tracking_double_click_ = false;
   SetMsgHandled(false);
 }
 
 void NativeTextfieldWin::OnPaste() {
   if (textfield_->read_only() || !ViewsDelegate::views_delegate)
     return;
 
-  ui::Clipboard* clipboard = ViewsDelegate::views_delegate->GetClipboard();
+  ui::Clipboard* clipboard = ui::Clipboard::GetForCurrentThread();
   if (!clipboard->IsFormatAvailable(ui::Clipboard::GetPlainTextWFormatType(),
                                     ui::Clipboard::BUFFER_STANDARD))
     return;
 
   string16 clipboard_str;
   clipboard->ReadText(ui::Clipboard::BUFFER_STANDARD, &clipboard_str);
   if (!clipboard_str.empty()) {
     string16 collapsed(CollapseWhitespace(clipboard_str, false));
     if (textfield_->style() & Textfield::STYLE_LOWERCASE)
       collapsed = base::i18n::ToLower(collapsed);
@@ skipping 220 matching lines @@
   context_menu_contents_->AddSeparator(ui::NORMAL_SEPARATOR);
   context_menu_contents_->AddItemWithStringId(IDS_APP_CUT, IDS_APP_CUT);
   context_menu_contents_->AddItemWithStringId(IDS_APP_COPY, IDS_APP_COPY);
   context_menu_contents_->AddItemWithStringId(IDS_APP_PASTE, IDS_APP_PASTE);
   context_menu_contents_->AddSeparator(ui::NORMAL_SEPARATOR);
   context_menu_contents_->AddItemWithStringId(IDS_APP_SELECT_ALL,
                                               IDS_APP_SELECT_ALL);
 }
 
 }  // namespace views