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

chrome/browser/extensions/platform_app_launcher.cc

Index: chrome/browser/extensions/platform_app_launcher.cc
diff --git a/chrome/browser/extensions/platform_app_launcher.cc b/chrome/browser/extensions/platform_app_launcher.cc
index c6c862cb767a3b8c66c3dcc31161eeffd5b9c43c..66d113338f59620615b5e9cd00e79441e271f5df 100644
--- a/chrome/browser/extensions/platform_app_launcher.cc
+++ b/chrome/browser/extensions/platform_app_launcher.cc
@@ -147,7 +147,7 @@ class PlatformAppPathLauncher
 
     // If the file doesn't exist, or is a directory, launch with no launch data.
     if (!base::PathExists(file_path_) ||
-        file_util::DirectoryExists(file_path_)) {
+        base::DirectoryExists(file_path_)) {
       LOG(WARNING) << "No file exists with path " << file_path_.value();
       BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, base::Bind(
               &PlatformAppPathLauncher::LaunchWithNoLaunchData, this));