Move PathIsWritable, DirectoryExists, ContentsEqual, and TextContentsEqual to the base namespace.

chrome/app/app_mode_loader_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.
 
 // On Mac, shortcuts can't have command-line arguments. Instead, produce small
 // app bundles which locate the Chromium framework and load it, passing the
 // appropriate data. This is the code for such an app bundle. It should be kept
 // minimal and do as little work as possible (with as much work done on
 // framework side as possible).
 
@@ skipping 33 matching lines @@
   CHECK(cr_bundle_id) << "couldn't get browser bundle ID";
 
   // First check if Chrome exists at the last known location.
   base::FilePath cr_bundle_path;
   NSString* cr_bundle_path_ns =
       [CFToNSCast(CFCastStrict<CFStringRef>(CFPreferencesCopyAppValue(
           NSToCFCast(app_mode::kLastRunAppBundlePathPrefsKey),
           NSToCFCast(cr_bundle_id)))) autorelease];
   cr_bundle_path = base::mac::NSStringToFilePath(cr_bundle_path_ns);
   bool found_bundle =
-      !cr_bundle_path.empty() && file_util::DirectoryExists(cr_bundle_path);
+      !cr_bundle_path.empty() && base::DirectoryExists(cr_bundle_path);
 
   if (!found_bundle) {
     // If no such bundle path exists, try to search by bundle ID.
     if (!app_mode::FindBundleById(cr_bundle_id, &cr_bundle_path)) {
       // TODO(jeremy): Display UI to allow user to manually locate the Chrome
       // bundle.
       LOG(FATAL) << "Failed to locate bundle by identifier";
     }
   }
 
@@ skipping 56 matching lines @@
 
   typedef int (*StartFun)(const app_mode::ChromeAppModeInfo*);
   StartFun ChromeAppModeStart = (StartFun)dlsym(cr_dylib, "ChromeAppModeStart");
   CHECK(ChromeAppModeStart) << "couldn't get entry point";
 
   // Exit instead of returning to avoid the the removal of |main()| from stack
   // backtraces under tail call optimization.
   int rv = ChromeAppModeStart(&info);
   exit(rv);
 }