Move PathExists to base namespace.

chrome/installer/util/create_dir_work_item.cc

Index: chrome/installer/util/create_dir_work_item.cc
diff --git a/chrome/installer/util/create_dir_work_item.cc b/chrome/installer/util/create_dir_work_item.cc
index a21d3eb0d856231ef5a53157ba112c741c181e9c..2e1ffa3c2dfaa6db0e0fc35acd956c012c033607 100644
--- a/chrome/installer/util/create_dir_work_item.cc
+++ b/chrome/installer/util/create_dir_work_item.cc
@@ -16,7 +16,7 @@ CreateDirWorkItem::CreateDirWorkItem(const base::FilePath& path)
 }
 
 void CreateDirWorkItem::GetTopDirToCreate() {
-  if (file_util::PathExists(path_)) {
+  if (base::PathExists(path_)) {
     top_path_ = base::FilePath();
     return;
   }
@@ -25,7 +25,7 @@ void CreateDirWorkItem::GetTopDirToCreate() {
   do {
     top_path_ = parent_dir;
     parent_dir = parent_dir.DirName();
-  } while ((parent_dir != top_path_) && !file_util::PathExists(parent_dir));
+  } while ((parent_dir != top_path_) && !base::PathExists(parent_dir));
   return;
 }
 
@@ -56,7 +56,7 @@ void CreateDirWorkItem::Rollback() {
   base::FilePath path_to_delete(path_);
 
   while (1) {
-    if (file_util::PathExists(path_to_delete)) {
+    if (base::PathExists(path_to_delete)) {
       if (!RemoveDirectory(path_to_delete.value().c_str()))
         break;
     }