Remove all blimp browsertests.

blimp/engine/browser_tests/blimp_contents_view_readback_helper.h

-// Copyright 2016 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.
-
-#ifndef BLIMP_ENGINE_BROWSER_TESTS_BLIMP_CONTENTS_VIEW_READBACK_HELPER_H_
-#define BLIMP_ENGINE_BROWSER_TESTS_BLIMP_CONTENTS_VIEW_READBACK_HELPER_H_
-
-#include "base/macros.h"
-#include "base/memory/weak_ptr.h"
-#include "base/synchronization/waitable_event.h"
-#include "blimp/client/public/contents/blimp_contents_view.h"
-
-namespace blimp {
-
-// A helper class to make grabbing a bitmap from a BlimpContentsView easier.
-// This can be used in conjunction with a WaitableContentPump to pause test
-// execution while waiting for the readback to finish.  An example use would be:
-//
-// WaitableContentPump pump;
-// BlimpContentsViewReadbackHelper helper;
-// blimp_contents->GetView()->CopyCompositingSurface(
-//    helper.GetCallback(), true);
-// pump.WaitFor(helper.event());
-// helper.bitmap();
-
-class BlimpContentsViewReadbackHelper {
- public:
-  BlimpContentsViewReadbackHelper();
-  virtual ~BlimpContentsViewReadbackHelper();
-
-  client::BlimpContentsView::ReadbackRequestCallback GetCallback();
-  SkBitmap* GetBitmap() const;
-
-  base::WaitableEvent* event() { return &event_; }
-
- private:
-  void OnReadbackComplete(std::unique_ptr<SkBitmap> bitmap);
-
-  base::WaitableEvent event_;
-  std::unique_ptr<SkBitmap> bitmap_;
-
-  base::WeakPtrFactory<BlimpContentsViewReadbackHelper> weak_ptr_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(BlimpContentsViewReadbackHelper);
-};
-
-}  // namespace blimp
-
-#endif  // BLIMP_ENGINE_BROWSER_TESTS_BLIMP_CONTENTS_VIEW_READBACK_HELPER_H_