Add base:: to string16s in chrome/.

chrome/test/perf/startup_test.cc

Index: chrome/test/perf/startup_test.cc
diff --git a/chrome/test/perf/startup_test.cc b/chrome/test/perf/startup_test.cc
index 3aa48dd4384754aaf0d8c1405d6da8b96c73a2a8..679d18029c6a1f19bdfc4441b9cc7634a00b14aa 100644
--- a/chrome/test/perf/startup_test.cc
+++ b/chrome/test/perf/startup_test.cc
@@ -119,7 +119,7 @@ class StartupTest : public UIPerfTest {
     // Read in preferences template.
     std::string pref_string;
     EXPECT_TRUE(base::ReadFileToString(pref_template_path, &pref_string));
-    string16 format_string = ASCIIToUTF16(pref_string);
+    base::string16 format_string = ASCIIToUTF16(pref_string);
 
     // Make sure temp directory has the proper format for writing to prefs file.
 #if defined(OS_POSIX)
@@ -133,7 +133,7 @@ class StartupTest : public UIPerfTest {
 #endif
 
     // Rewrite prefs file.
-    std::vector<string16> subst;
+    std::vector<base::string16> subst;
     subst.push_back(WideToUTF16(user_data_dir_w));
     const std::string prefs_string =
         UTF16ToASCII(ReplaceStringPlaceholders(format_string, subst, NULL));