Simplify the user agent overriding code, in preparation for moving it out of src/webkit.

content/app/content_main_runner.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 "content/public/app/content_main_runner.h"
 
 #include <stdlib.h>
 
 #include "base/allocator/allocator_extension.h"
 #include "base/at_exit.h"
@@ skipping 366 matching lines @@
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
   std::string process_type =
       command_line.GetSwitchValueASCII(switches::kProcessType);
   ContentClientInitializer::Set(process_type, delegate);
 
   // If a custom user agent was passed on the command line, we need
   // to (re)set it now, rather than using the default one the zygote
   // initialized.
   if (command_line.HasSwitch(switches::kUserAgent)) {
     webkit_glue::SetUserAgent(
-        command_line.GetSwitchValueASCII(switches::kUserAgent), true);
+        command_line.GetSwitchValueASCII(switches::kUserAgent));
   }
 
   // The StatsTable must be initialized in each process; we already
   // initialized for the browser process, now we need to initialize
   // within the new processes as well.
   InitializeStatsTable(command_line);
 
   MainFunctionParams main_params(command_line);
 
   for (size_t i = 0; i < arraysize(kMainFunctions); ++i) {
@@ skipping 341 matching lines @@
     InitializeStatsTable(command_line);
 
     if (delegate)
       delegate->PreSandboxStartup();
 
     // Set any custom user agent passed on the command line now so the string
     // doesn't change between calls to webkit_glue::GetUserAgent(), otherwise it
     // defaults to the user agent set during SetContentClient().
     if (command_line.HasSwitch(switches::kUserAgent)) {
       webkit_glue::SetUserAgent(
-          command_line.GetSwitchValueASCII(switches::kUserAgent), true);
+          command_line.GetSwitchValueASCII(switches::kUserAgent));
     }
 
     if (!process_type.empty())
       CommonSubprocessInit(process_type);
 
 #if defined(OS_WIN)
     CHECK(InitializeSandbox(sandbox_info));
 #elif defined(OS_MACOSX) && !defined(OS_IOS)
     if (process_type == switches::kRendererProcess ||
         process_type == switches::kPpapiPluginProcess ||
@@ skipping 92 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(ContentMainRunnerImpl);
 };
 
 // static
 ContentMainRunner* ContentMainRunner::Create() {
   return new ContentMainRunnerImpl();
 }
 
 }  // namespace content