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

base/native_library_mac.mm

 // Copyright (c) 2011 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 "base/native_library.h"
 
 #include <dlfcn.h>
 #include <mach-o/getsect.h>
 
 #include "base/file_util.h"
@@ skipping 27 matching lines @@
       reinterpret_cast<const struct mach_header*>(info.dli_fbase),
       SEG_OBJC, "__image_info");
 #endif
   return section == NULL ? OBJC_NOT_PRESENT : OBJC_PRESENT;
 }
 
 // static
 NativeLibrary LoadNativeLibrary(const base::FilePath& library_path,
                                 std::string* error) {
   // dlopen() etc. open the file off disk.
-  if (library_path.Extension() == "dylib" ||
-      !file_util::DirectoryExists(library_path)) {
+  if (library_path.Extension() == "dylib" || !DirectoryExists(library_path)) {
     void* dylib = dlopen(library_path.value().c_str(), RTLD_LAZY);
     if (!dylib)
       return NULL;
     NativeLibrary native_lib = new NativeLibraryStruct();
     native_lib->type = DYNAMIC_LIB;
     native_lib->dylib = dylib;
     native_lib->objc_status = OBJC_UNKNOWN;
     return native_lib;
   }
   base::ScopedCFTypeRef<CFURLRef> url(CFURLCreateFromFileSystemRepresentation(
@@ skipping 57 matching lines @@
 
   return function_pointer;
 }
 
 // static
 string16 GetNativeLibraryName(const string16& name) {
   return name + ASCIIToUTF16(".dylib");
 }
 
 }  // namespace base