Move temp file functions to base namespace.

chrome/installer/test/alternate_version_generator.cc

Index: chrome/installer/test/alternate_version_generator.cc
diff --git a/chrome/installer/test/alternate_version_generator.cc b/chrome/installer/test/alternate_version_generator.cc
index d00da4fa2a9986301785be130d7271275f304a2e..6b65aa1285da051017869dd9e3ada1c08e2c89f3 100644
--- a/chrome/installer/test/alternate_version_generator.cc
+++ b/chrome/installer/test/alternate_version_generator.cc
@@ -84,7 +84,7 @@ class ScopedTempDirectory {
   // Creates a temporary directory.
   bool Initialize() {
     DCHECK(directory_.empty());
-    if (!file_util::CreateNewTempDirectory(&kTempDirPrefix[0], &directory_)) {
+    if (!base::CreateNewTempDirectory(&kTempDirPrefix[0], &directory_)) {
       LOG(DFATAL) << "Failed creating temporary directory.";
       return false;
     }