Use base::StartWith() in more places when appropriate.

chrome/test/ppapi/ppapi_filechooser_browsertest.cc

 // Copyright 2015 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 <map>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
+#include "base/strings/string_util.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/test/ppapi/ppapi_test.h"
 #include "ppapi/shared_impl/test_utils.h"
 #include "ui/shell_dialogs/select_file_dialog.h"
 #include "ui/shell_dialogs/select_file_dialog_factory.h"
 #include "ui/shell_dialogs/selected_file_info.h"
 
 #if defined(FULL_SAFE_BROWSING)
 #include "chrome/browser/safe_browsing/download_protection_service.h"
@@ skipping 119 matching lines @@
       DownloadProtectionService::SAFE;
 };
 
 class FakeDatabaseManager
     : public safe_browsing::TestSafeBrowsingDatabaseManager {
  public:
   bool IsSupported() const override { return true; }
   bool MatchDownloadWhitelistUrl(const GURL& url) override {
     // This matches the behavior in RunTestViaHTTP().
     return url.SchemeIsHTTPOrHTTPS() && url.has_path() &&
-           url.path().find("/test_case.html") == 0;
+           base::StartsWith(url.path(), "/test_case.html",
+                            base::CompareCase::SENSITIVE);
   }
 
  protected:
   ~FakeDatabaseManager() override {}
 };
 
 class FakeDownloadProtectionService : public DownloadProtectionService {
  public:
   explicit FakeDownloadProtectionService(
       const SafeBrowsingTestConfiguration* test_config)
@@ skipping 242 matching lines @@
       std::make_pair(base::FilePath::StringType(FILE_PATH_LITERAL(".exe")),
                      DownloadProtectionService::DANGEROUS));
 
   TestSelectFileDialogFactory test_dialog_factory(
       TestSelectFileDialogFactory::NOT_REACHED,
       TestSelectFileDialogFactory::SelectedFileInfoList());
   RunTestViaHTTP("FileChooser_SaveAsDangerousExtensionListDisallowed");
 }
 
 #endif  // FULL_SAFE_BROWSING