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

chrome/browser/performance_monitor/database.cc

Index: chrome/browser/performance_monitor/database.cc
diff --git a/chrome/browser/performance_monitor/database.cc b/chrome/browser/performance_monitor/database.cc
index 36bc93c9f0b6df6f8e210f2799328458f7af3eb1..c08c2b8cc83b943c252d01789eed7b438d2988c1 100644
--- a/chrome/browser/performance_monitor/database.cc
+++ b/chrome/browser/performance_monitor/database.cc
@@ -91,7 +91,7 @@ scoped_ptr<Database> Database::Create(base::FilePath path) {
     path = path.AppendASCII(kDbDir);
   }
   scoped_ptr<Database> database;
-  if (!file_util::DirectoryExists(path) && !file_util::CreateDirectory(path))
+  if (!base::DirectoryExists(path) && !file_util::CreateDirectory(path))
     return database.Pass();
   database.reset(new Database(path));