Move PathExists to base namespace.

chrome/installer/util/self_cleaning_temp_dir.cc

Index: chrome/installer/util/self_cleaning_temp_dir.cc
diff --git a/chrome/installer/util/self_cleaning_temp_dir.cc b/chrome/installer/util/self_cleaning_temp_dir.cc
index bb2fd6c6f992036ef2aab00266eaa06befd6f6aa..8b859261acb31a6be299d765b8fd51465fb58ae2 100644
--- a/chrome/installer/util/self_cleaning_temp_dir.cc
+++ b/chrome/installer/util/self_cleaning_temp_dir.cc
@@ -21,7 +21,7 @@ void SelfCleaningTempDir::GetTopDirToCreate(
     base::FilePath* base_dir) {
   DCHECK(base_dir);
 
-  if (file_util::PathExists(temp_parent_dir)) {
+  if (base::PathExists(temp_parent_dir)) {
     // Empty base_dir means that we didn't create any extra directories.
     base_dir->clear();
   } else {
@@ -29,7 +29,7 @@ void SelfCleaningTempDir::GetTopDirToCreate(
     do {
       *base_dir = parent_dir;
       parent_dir = parent_dir.DirName();
-    } while (parent_dir != *base_dir && !file_util::PathExists(parent_dir));
+    } while (parent_dir != *base_dir && !base::PathExists(parent_dir));
     LOG_IF(WARNING, !file_util::DirectoryExists(parent_dir))
         << "A non-directory is at the base of the path leading to a desired "
            "temp directory location: " << parent_dir.value();