Move PathExists to base namespace.

chrome/test/webdriver/commands/webelement_commands.cc

Index: chrome/test/webdriver/commands/webelement_commands.cc
diff --git a/chrome/test/webdriver/commands/webelement_commands.cc b/chrome/test/webdriver/commands/webelement_commands.cc
index 5ecff827874551bc088771d8557aa5d3c10bc96c..1bea1deb6bd577a5731bf1e27370e7a0e47d98cb 100644
--- a/chrome/test/webdriver/commands/webelement_commands.cc
+++ b/chrome/test/webdriver/commands/webelement_commands.cc
@@ -561,7 +561,7 @@ Error* ElementValueCommand::DragAndDropFilePaths() const {
 
   // Check the files exist.
   for (size_t i = 0; i < paths.size(); ++i) {
-    if (!file_util::PathExists(base::FilePath(paths[i]))) {
+    if (!base::PathExists(base::FilePath(paths[i]))) {
       return new Error(
           kBadRequest,
           base::StringPrintf("'%s' does not exist on the file system",