Remove all blimp browsertests.

blimp/engine/browser_tests/waitable_content_pump.cc

-// 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.
-
-#include "blimp/engine/browser_tests/waitable_content_pump.h"
-
-#include "content/public/browser/browser_thread.h"
-#include "content/public/test/test_utils.h"
-
-namespace blimp {
-
-WaitableContentPump::WaitableContentPump()
-    : event_(base::WaitableEvent::ResetPolicy::MANUAL,
-             base::WaitableEvent::InitialState::NOT_SIGNALED) {}
-
-WaitableContentPump::~WaitableContentPump() = default;
-
-// static
-void WaitableContentPump::WaitFor(base::WaitableEvent* event) {
-  while (!event->IsSignaled()) {
-    content::RunAllPendingInMessageLoop(content::BrowserThread::UI);
-    content::RunAllPendingInMessageLoop(content::BrowserThread::IO);
-    content::RunAllPendingInMessageLoop(content::BrowserThread::FILE);
-  }
-  event->Reset();
-}
-
-void WaitableContentPump::Wait() {
-  WaitableContentPump::WaitFor(&event_);
-}
-
-}  // namespace blimp