Revert of Improve linearized pdf load/show time.

pdf/run_all_unittests.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 "base/test/launcher/unit_test_launcher.h"
-#include "base/test/test_suite.h"
-
-// ppapi_cpp won't link w/o this.
-namespace pp {
-
-class Module;
-
-Module* CreateModule() {
-  return nullptr;
-}
-
-}  // namespace pp
-
-int main(int argc, char** argv) {
-  base::TestSuite test_suite(argc, argv);
-  return base::LaunchUnitTests(
-      argc, argv,
-      base::Bind(&base::TestSuite::Run, base::Unretained(&test_suite)));
-}