[Cleanup] Remove StringPrintf from global namespace

use of StringPrintf now requires prefixing with base:: or a per-scope using directive

TBR'd:
abodenha: chrome/service
brettw: content, third_party, webkit
darin: base, chrome/browser, chrome/renderer
dgarret: courgette
enne: cc
fischmann: media
gbillock: sql
joi: google_apis,components
rsleevi: net, crypto
sky: chrome/test
thestig: printing, chrome/common,
tsepez: ipc
wez: remoting
yfriedman: testing/android

NOTRY=true
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BUG=

Review URL: https://codereview.chromium.org/12767006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@188857 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/base/file_util.cc b/base/file_util.cc
index f951e3b..5567f74b 100644
--- a/base/file_util.cc
+++ b/base/file_util.cc
@@ -278,7 +278,8 @@
 
   FilePath new_path;
   for (int count = 1; count <= kMaxUniqueFiles; ++count) {
-    new_path = path.InsertBeforeExtensionASCII(StringPrintf(" (%d)", count));
+    new_path =
+        path.InsertBeforeExtensionASCII(base::StringPrintf(" (%d)", count));
     if (!PathExists(new_path) &&
         (!have_suffix || !PathExists(FilePath(new_path.value() + suffix)))) {
       return count;