Add default testing command line flags in UITestBase instead of ProxyLauncher.

chrome/test/automation/proxy_launcher.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/test/automation/proxy_launcher.h"
 
 #include <vector>
 
 #include "base/environment.h"
 #include "base/file_util.h"
@@ skipping 330 matching lines @@
 
   base::CloseProcessHandle(process_);
   process_ = base::kNullProcessHandle;
   process_id_ = -1;
 
   return success;
 }
 
 void ProxyLauncher::PrepareTestCommandline(CommandLine* command_line,
                                            bool include_testing_id) {
-  // Propagate commandline settings from test_launcher_utils.
-  test_launcher_utils::PrepareBrowserCommandLineForTests(command_line);
-
   // Add any explicit command line flags passed to the process.
   CommandLine::StringType extra_chrome_flags =
       CommandLine::ForCurrentProcess()->GetSwitchValueNative(
           switches::kExtraChromeFlags);
   if (!extra_chrome_flags.empty()) {
     // Split by spaces and append to command line.
     std::vector<CommandLine::StringType> flags;
     base::SplitStringAlongWhitespace(extra_chrome_flags, &flags);
     for (size_t i = 0; i < flags.size(); ++i)
       command_line->AppendArgNative(flags[i]);
@@ skipping 234 matching lines @@
   return LaunchBrowserAndServer(state, wait_for_initial_loads);
 }
 
 void AnonymousProxyLauncher::TerminateConnection() {
   CloseBrowserAndServer();
 }
 
 std::string AnonymousProxyLauncher::PrefixedChannelID() const {
   return channel_id_;
 }