[Cleanup] Remove StringPrintf from global namespace

chrome/browser/sessions/persistent_tab_restore_service_browsertest.cc

Index: chrome/browser/sessions/persistent_tab_restore_service_browsertest.cc
diff --git a/chrome/browser/sessions/persistent_tab_restore_service_browsertest.cc b/chrome/browser/sessions/persistent_tab_restore_service_browsertest.cc
index c39742ade6a80fa273e1d69511b1bb8d8ae56060..1c6675c1c7f3382cbd322e87be8e27013a8c711f 100644
--- a/chrome/browser/sessions/persistent_tab_restore_service_browsertest.cc
+++ b/chrome/browser/sessions/persistent_tab_restore_service_browsertest.cc
@@ -592,8 +592,8 @@ TEST_F(PersistentTabRestoreServiceTest, PruneEntries) {
   for (size_t i = 0; i < max_entries + 5; i++) {
     TabNavigation navigation =
         SessionTypesTestHelper::CreateNavigation(
-            StringPrintf("http://%d", static_cast<int>(i)),
-            StringPrintf("%d", static_cast<int>(i)));
+            base::StringPrintf("http://%d", static_cast<int>(i)),
+            base::StringPrintf("%d", static_cast<int>(i)));
 
     Tab* tab = new Tab();
     tab->navigations.push_back(navigation);
@@ -683,7 +683,8 @@ TEST_F(PersistentTabRestoreServiceTest, PruneIsCalled) {
 
   const size_t max_entries = kMaxEntries;
   for (size_t i = 0; i < max_entries + 5; i++) {
-    NavigateAndCommit(GURL(StringPrintf("http://%d", static_cast<int>(i))));
+    NavigateAndCommit(
+        GURL(base::StringPrintf("http://%d", static_cast<int>(i))));
     service_->CreateHistoricalTab(web_contents(), -1);
   }