Remove duplication between Mandoline and mojo_runner main functions.

mojo/runner/desktop/main_helper.cc

 // Copyright 2015 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 "mojo/runner/desktop/main_helper.h"
+
+
 #include "base/at_exit.h"
+#include "base/base_switches.h"
 #include "base/command_line.h"
+#include "base/debug/debugger.h"
 #include "base/debug/stack_trace.h"
+#include "base/files/file_path.h"
+#include "base/logging.h"
 #include "base/process/launch.h"
-#include "mandoline/app/desktop/launcher_process.h"
+#include "base/stl_util.h"
+#include "base/strings/string_split.h"
+#include "base/strings/utf_string_conversions.h"
+#include "mojo/runner/desktop/launcher_process.h"
 #include "mojo/runner/host/child_process.h"
 #include "mojo/runner/host/switches.h"
 #include "mojo/runner/init.h"
 
-int main(int argc, char** argv) {
+#if defined(OS_WIN)
+#include <windows.h>
+#elif (OS_POSIX)
+#include <unistd.h>
+#endif
+
+namespace mojo {
+namespace runner {
+
+int RunnerMain(int argc, char** argv,
+               const GURL& mojo_url,
+               const base::Closure& callback) {
   base::CommandLine::Init(argc, argv);
   const base::CommandLine& command_line =
       *base::CommandLine::ForCurrentProcess();
 
   base::AtExitManager at_exit;
-  mojo::runner::InitializeLogging();
-  mojo::runner::WaitForDebuggerIfNecessary();
+  InitializeLogging();
+  WaitForDebuggerIfNecessary();
 
 #if !defined(OFFICIAL_BUILD)
   base::debug::EnableInProcessStackDumping();
 #if defined(OS_WIN)
   base::RouteStdioToConsole(false);
 #endif
 #endif
 
   if (command_line.HasSwitch(switches::kChildProcess))
-    return mojo::runner::ChildProcessMain();
+    return ChildProcessMain();
 
-  return mandoline::LauncherProcessMain(argc, argv);
+  return LauncherProcessMain(mojo_url, callback);
 }
+
+}  // namespace runner
+}  // namespace mojo