Move file_util::Delete to the base namespace

chrome/test/automation/proxy_launcher.cc

Index: chrome/test/automation/proxy_launcher.cc
diff --git a/chrome/test/automation/proxy_launcher.cc b/chrome/test/automation/proxy_launcher.cc
index 2a81cef1c0ca2a907a883896bf0d45120d3b0250..4b40cc18b27df2699156d5825a2d3ba00face675 100644
--- a/chrome/test/automation/proxy_launcher.cc
+++ b/chrome/test/automation/proxy_launcher.cc
@@ -559,7 +559,7 @@ bool NamedProxyLauncher::InitializeConnection(const LaunchState& state,
 #if defined(OS_POSIX)
     // Because we are waiting on the existence of the testing file below,
     // make sure there isn't one already there before browser launch.
-    if (!file_util::Delete(base::FilePath(channel_id_), false)) {
+    if (!base::Delete(base::FilePath(channel_id_), false)) {
       LOG(ERROR) << "Failed to delete " << channel_id_;
       return false;
     }