Move PathExists to base namespace.

chrome/browser/renderer_host/pepper/device_id_fetcher.cc

Index: chrome/browser/renderer_host/pepper/device_id_fetcher.cc
diff --git a/chrome/browser/renderer_host/pepper/device_id_fetcher.cc b/chrome/browser/renderer_host/pepper/device_id_fetcher.cc
index a21b285c1f56fa8915d13a6ced586483dc91f81e..39380db6c94c6bae33fef571193634cbe9a922a3 100644
--- a/chrome/browser/renderer_host/pepper/device_id_fetcher.cc
+++ b/chrome/browser/renderer_host/pepper/device_id_fetcher.cc
@@ -167,7 +167,7 @@ void DeviceIDFetcher::ComputeOnBlockingPool(const base::FilePath& profile_path,
   // First check if the legacy device ID file exists on ChromeOS. If it does, we
   // should just return that.
   base::FilePath id_path = GetLegacyDeviceIDPath(profile_path);
-  if (file_util::PathExists(id_path)) {
+  if (base::PathExists(id_path)) {
     if (file_util::ReadFileToString(id_path, &id) && !id.empty()) {
       RunCallbackOnIOThread(id);
       return;