Move PathExists to base namespace.

chrome/test/mini_installer_test/installer_path_provider.cc

Index: chrome/test/mini_installer_test/installer_path_provider.cc
diff --git a/chrome/test/mini_installer_test/installer_path_provider.cc b/chrome/test/mini_installer_test/installer_path_provider.cc
index a4de03759c07a3f7db40feb320f94fc0fbdf7ff0..5974661a9556474826d27b51aec894d433f0a656 100644
--- a/chrome/test/mini_installer_test/installer_path_provider.cc
+++ b/chrome/test/mini_installer_test/installer_path_provider.cc
@@ -110,7 +110,7 @@ bool InstallerPathProvider::GetMiniInstaller(base::FilePath* path) {
   // Use local copy of installer, else fall back to filer.
   base::FilePath mini_installer = PathFromExeDir(
       mini_installer_constants::kChromeMiniInstallerExecutable);
-  if (file_util::PathExists(mini_installer)) {
+  if (base::PathExists(mini_installer)) {
     *path = mini_installer;
     return true;
   }
@@ -166,7 +166,7 @@ bool InstallerPathProvider::GetStandaloneInstaller(base::FilePath* path) {
       .Append(mini_installer_constants::kWinFolder)
       .AppendASCII(standalone_installer_filename);
   *path = standalone_installer;
-  return file_util::PathExists(standalone_installer);
+  return base::PathExists(standalone_installer);
 }
 
 bool InstallerPathProvider::GetSignedStandaloneInstaller(base::FilePath* path) {