Remove all blimp browsertests.

blimp/engine/browser_tests/waitable_content_pump.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_WAITABLE_CONTENT_PUMP_H_
-#define BLIMP_ENGINE_BROWSER_TESTS_WAITABLE_CONTENT_PUMP_H_
-
-#include "base/macros.h"
-#include "base/synchronization/waitable_event.h"
-
-namespace blimp {
-
-// A helper class to suspend execution on the current stack and still allow all
-// content message loops to run until a WaitableEvent is signaled.  This
-// currently only pumps the UI, IO, and FILE threads.  The typical use case
-// would look like:
-//
-// WaitableContentPump waiter;
-// GiveEventToSomeoneToEventuallySignal(waiter.event());
-// waiter.Wait();
-class WaitableContentPump {
- public:
-  WaitableContentPump();
-  virtual ~WaitableContentPump();
-
-  // Pumps content message loops until |event| is signaled.  This will reset
-  // |event| afterwards.
-  static void WaitFor(base::WaitableEvent* event);
-
-  // Helper methods to use the WaitableContentPump without needing to build a
-  // WaitableEvent.
-  base::WaitableEvent* event() { return &event_; }
-  void Wait();
-
- private:
-  base::WaitableEvent event_;
-
-  DISALLOW_COPY_AND_ASSIGN(WaitableContentPump);
-};
-
-}  // namespace blimp
-
-#endif  // BLIMP_ENGINE_BROWSER_TESTS_WAITABLE_CONTENT_PUMP_H_