Reland of place string::find(prefix) == 0 pattern with base::StartsWith().

ppapi/shared_impl/test_utils.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ppapi/shared_impl/test_utils.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <cmath>
@@ skipping 195 matching lines @@
 }  // namespace
 
 bool TestEqual(const PP_Var& expected,
                const PP_Var& actual,
                bool test_string_references) {
   base::hash_map<int64_t, int64_t> visited_map;
   return Equals(expected, actual, test_string_references, &visited_map);
 }
 
 std::string StripTestPrefixes(const std::string& test_name) {
-  if (test_name.find("DISABLED_") == 0)
-    return test_name.substr(strlen("DISABLED_"));
+  const char kDisabledPrefix[] = "DISABLED_";
+  if (base::StartsWith(test_name, kDisabledPrefix,
+                       base::CompareCase::SENSITIVE)) {
+    return test_name.substr(sizeof(kDisabledPrefix) - 1);
+  }
   return test_name;
 }
 
 }  // namespace ppapi