Try 2 - Change how ui::Clipboard is accessed so there's only one per thread.

ui/views/controls/textfield/native_textfield_views_unittest.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 <string>
 #include <vector>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 16 matching lines @@
 #include "ui/base/ui_base_switches.h"
 #include "ui/gfx/render_text.h"
 #include "ui/views/controls/textfield/native_textfield_views.h"
 #include "ui/views/controls/textfield/textfield.h"
 #include "ui/views/controls/textfield/textfield_controller.h"
 #include "ui/views/controls/textfield/textfield_views_model.h"
 #include "ui/views/focus/focus_manager.h"
 #include "ui/views/ime/mock_input_method.h"
 #include "ui/views/test/test_views_delegate.h"
 #include "ui/views/test/views_test_base.h"
-#include "ui/views/views_delegate.h"
 #include "ui/views/widget/native_widget_private.h"
 #include "ui/views/widget/widget.h"
 
 namespace {
 
 // A wrapper of Textfield to intercept the result of OnKeyPressed() and
 // OnKeyReleased() methods.
 class TestTextfield : public views::Textfield {
  public:
   explicit TestTextfield(StyleFlags style)
@@ skipping 180 matching lines @@
       SendKeyEvent(code);
     } else {
       ui::KeyEvent event(ui::ET_KEY_PRESSED, ui::VKEY_UNKNOWN, 0);
       event.set_character(ch);
       input_method_->DispatchKeyEvent(event);
     }
   }
 
   string16 GetClipboardText() const {
     string16 text;
-    views::ViewsDelegate::views_delegate->GetClipboard()->
+    ui::Clipboard::GetForCurrentThread()->
         ReadText(ui::Clipboard::BUFFER_STANDARD, &text);
     return text;
   }
 
   void SetClipboardText(const std::string& text) {
     ui::ScopedClipboardWriter clipboard_writer(
-        views::ViewsDelegate::views_delegate->GetClipboard(),
+        ui::Clipboard::GetForCurrentThread(),
         ui::Clipboard::BUFFER_STANDARD);
     clipboard_writer.WriteText(ASCIIToUTF16(text));
   }
 
   View* GetFocusedView() {
     return widget_->GetFocusManager()->GetFocusedView();
   }
 
   int GetCursorPositionX(int cursor_pos) {
     gfx::RenderText* render_text = textfield_view_->GetRenderText();
@@ skipping 840 matching lines @@
   EXPECT_STR_EQ(" one two three ", textfield_->GetSelectedText());
 
   // CUT&PASTE does not work, but COPY works
   SetClipboardText("Test");
   SendKeyEvent(ui::VKEY_X, false, true);
   EXPECT_STR_EQ(" one two three ", textfield_->GetSelectedText());
   string16 str(GetClipboardText());
   EXPECT_STR_NE(" one two three ", str);
 
   SendKeyEvent(ui::VKEY_C, false, true);
-  views::ViewsDelegate::views_delegate->GetClipboard()->
+  ui::Clipboard::GetForCurrentThread()->
       ReadText(ui::Clipboard::BUFFER_STANDARD, &str);
   EXPECT_STR_EQ(" one two three ", str);
 
   // SetText should work even in read only mode.
   textfield_->SetText(ASCIIToUTF16(" four five six "));
   EXPECT_STR_EQ(" four five six ", textfield_->text());
 
   // Paste shouldn't work.
   SendKeyEvent(ui::VKEY_V, false, true);
   EXPECT_STR_EQ(" four five six ", textfield_->text());
@@ skipping 561 matching lines @@
     EXPECT_EQ(char_rect[i], actual_rect) << " i=" << i;
   }
 
   // Return false if the index is out of range.
   EXPECT_FALSE(client->GetCompositionCharacterBounds(char_count, &rect));
   EXPECT_FALSE(client->GetCompositionCharacterBounds(char_count + 1, &rect));
   EXPECT_FALSE(client->GetCompositionCharacterBounds(char_count + 100, &rect));
 }
 
 }  // namespace views