Update base::StartsWith calls to new form

chrome/browser/prefs/tracked/pref_hash_browsertest.cc

 // Copyright 2014 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 <string>
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/json/json_file_value_serializer.h"
@@ skipping 291 matching lines @@
   // orchestrated in AttackPreferencesOnDisk().
   virtual void VerifyReactionToPrefAttack() = 0;
 
   int num_tracked_prefs() const { return num_tracked_prefs_; }
 
   const SettingsProtectionLevel protection_level_;
 
  private:
   // Returns true if this is the PRE_ phase of the test.
   bool IsPRETest() {
-    return base::StartsWithASCII(
+    return base::StartsWith(
         testing::UnitTest::GetInstance()->current_test_info()->name(), "PRE_",
-        true /* case_sensitive */);
+        base::CompareCase::SENSITIVE);
   }
 
   SettingsProtectionLevel GetProtectionLevelFromTrialGroup(
       const std::string& trial_group) {
     if (!ProfilePrefStoreManager::kPlatformSupportsPreferenceTracking)
       return PROTECTION_DISABLED_ON_PLATFORM;
 
 // Protection levels can't be adjusted via --force-fieldtrials in official
 // builds.
 #if defined(OFFICIAL_BUILD)
@@ skipping 592 matching lines @@
                   "Settings.TrackedPreferenceNullInitialized", ALLOW_NONE));
     EXPECT_EQ(
         0,
         GetTrackedPrefHistogramCount(
             "Settings.TrackedPreferenceMigratedLegacyDeviceId", ALLOW_NONE));
   }
 };
 
 PREF_HASH_BROWSER_TEST(PrefHashBrowserTestUntrustedAdditionToPrefsAfterWipe,
                        UntrustedAdditionToPrefsAfterWipe);