Remove code related to the PreReadChromeChildInBrowser field trial.

chrome/browser/chrome_browser_main.cc

 // Copyright (c) 2012 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 "chrome/browser/chrome_browser_main.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 189 matching lines @@
 #endif  // defined(OS_CHROMEOS)
 
 // TODO(port): several win-only methods have been pulled out of this, but
 // BrowserMain() as a whole needs to be broken apart so that it's usable by
 // other platforms. For now, it's just a stub. This is a serious work in
 // progress and should not be taken as an indication of a real refactoring.
 
 #if defined(OS_WIN)
 #include "base/trace_event/trace_event_etw_export_win.h"
 #include "base/win/windows_version.h"
-#include "chrome/app/file_pre_reader_win.h"
 #include "chrome/browser/chrome_browser_main_win.h"
 #include "chrome/browser/component_updater/sw_reporter_installer_win.h"
 #include "chrome/browser/downgrade/user_data_downgrade.h"
 #include "chrome/browser/first_run/try_chrome_dialog_view.h"
 #include "chrome/browser/first_run/upgrade_util_win.h"
 #include "chrome/browser/metrics/chrome_metrics_service_accessor.h"
 #include "chrome/browser/ui/network_profile_bubble.h"
 #include "chrome/browser/win/browser_util.h"
 #include "chrome/browser/win/chrome_select_file_dialog_factory.h"
 #include "chrome/installer/util/browser_distribution.h"
 #include "chrome/installer/util/helper.h"
 #include "chrome/installer/util/install_util.h"
-#include "chrome/installer/util/module_util_win.h"
 #include "chrome/installer/util/shell_util.h"
 #include "components/startup_metric_utils/common/pre_read_field_trial_utils_win.h"
 #include "ui/base/l10n/l10n_util_win.h"
 #include "ui/shell_dialogs/select_file_dialog.h"
 #endif  // defined(OS_WIN)
 
 #if defined(OS_MACOSX)
 #include <Security/Security.h>
 
 #include "base/mac/scoped_nsautorelease_pool.h"
@@ skipping 1320 matching lines @@
   AfterStartupTaskUtils::StartMonitoringStartup();
 }
 
 int ChromeBrowserMainParts::PreMainMessageLoopRunImpl() {
   TRACE_EVENT0("startup", "ChromeBrowserMainParts::PreMainMessageLoopRunImpl");
 
   SCOPED_UMA_HISTOGRAM_LONG_TIMER("Startup.PreMainMessageLoopRunImplLongTime");
   const base::TimeTicks start_time_step1 = base::TimeTicks::Now();
 
 #if defined(OS_WIN)
-  // Pre-read chrome_child.dll.
-  const startup_metric_utils::PreReadOptions pre_read_options =
-      startup_metric_utils::GetPreReadOptions();
-  if (pre_read_options.pre_read &&
-      pre_read_options.pre_read_chrome_child_in_browser) {
-    BrowserThread::PostTask(
-        BrowserThread::FILE_USER_BLOCKING, FROM_HERE,
-        base::Bind(&PreReadFile,
-                   installer::GetModulePath(installer::kChromeChildDll),
-                   pre_read_options));
-  }
-
   // Windows parental controls calls can be slow, so we do an early init here
   // that calculates this value off of the UI thread.
   IncognitoModePrefs::InitializePlatformParentalControls();
 #endif
 
 #if defined(ENABLE_EXTENSIONS)
   if (!variations::GetVariationParamValue(
       "LightSpeed", "EarlyInitStartup").empty()) {
     // Try to compute this early on another thread so that we don't spend time
     // during profile load initializing the extensions APIs.
@@ skipping 638 matching lines @@
   chromeos::CrosSettings::Shutdown();
 #endif  // defined(OS_CHROMEOS)
 #endif  // defined(OS_ANDROID)
 }
 
 // Public members:
 
 void ChromeBrowserMainParts::AddParts(ChromeBrowserMainExtraParts* parts) {
   chrome_extra_parts_.push_back(parts);
 }