Revert "reland of Improve linearized pdf load/show time."

pdf/timer.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 "pdf/timer.h"
-
-#include "ppapi/cpp/core.h"
-#include "ppapi/cpp/module.h"
-
-namespace chrome_pdf {
-
-Timer::Timer(int delay_in_milliseconds)
-    : delay_(delay_in_milliseconds), callback_factory_(this) {
-  PostCallback();
-}
-
-Timer::~Timer() {
-}
-
-void Timer::PostCallback() {
-  pp::CompletionCallback callback =
-      callback_factory_.NewCallback(&Timer::TimerProc);
-  pp::Module::Get()->core()->CallOnMainThread(delay_, callback, 0);
-}
-
-void Timer::TimerProc(int32_t /*result*/) {
-  PostCallback();
-  OnTimer();
-}
-
-}  // namespace chrome_pdf