Fix more remaining FilePath -> base::FilePath.

chrome/app/chrome_main_mac.mm

 // 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/app/chrome_main_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
 #include "base/logging.h"
 #import "base/mac/bundle_locations.h"
 #import "base/mac/foundation_util.h"
 #import "base/mac/scoped_nsautorelease_pool.h"
 #include "base/sys_string_conversions.h"
 #include "chrome/browser/policy/policy_path_parser.h"
 #include "chrome/common/chrome_paths_internal.h"
 #include "policy/policy_constants.h"
 
-void CheckUserDataDirPolicy(FilePath* user_data_dir) {
+void CheckUserDataDirPolicy(base::FilePath* user_data_dir) {
   base::mac::ScopedNSAutoreleasePool pool;
 
   // Since the configuration management infrastructure is not initialized when
   // this code runs, read the policy preference directly.
   NSString* key = base::SysUTF8ToNSString(policy::key::kUserDataDir);
   NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
   NSString* value = [defaults stringForKey:key];
   if (value && [defaults objectIsForcedForKey:key]) {
     std::string string_value = base::SysNSStringToUTF8(value);
     // Now replace any vars the user might have used.
     string_value =
         policy::path_parser::ExpandPathVariables(string_value);
-    *user_data_dir = FilePath(string_value);
+    *user_data_dir = base::FilePath(string_value);
   }
 }
 
 void SetUpBundleOverrides() {
   base::mac::ScopedNSAutoreleasePool pool;
 
   base::mac::SetOverrideFrameworkBundlePath(chrome::GetFrameworkBundlePath());
 
   NSBundle* base_bundle = chrome::OuterAppBundle();
   base::mac::SetBaseBundleID([[base_bundle bundleIdentifier] UTF8String]);
 }