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

components/nacl/renderer/ppb_nacl_private_impl.cc

 // Copyright 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 "components/nacl/renderer/ppb_nacl_private.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
@@ skipping 1450 matching lines @@
   DCHECK(load_manager);
   if (!load_manager) {
     base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE, base::Bind(callback, static_cast<int32_t>(PP_ERROR_FAILED),
                               kInvalidNaClFileInfo));
     return;
   }
 
   // Handle special PNaCl support files which are installed on the user's
   // machine.
-  if (url.find(kPNaClTranslatorBaseUrl, 0) == 0) {
+  if (base::StartsWith(url, kPNaClTranslatorBaseUrl,
+                       base::CompareCase::SENSITIVE)) {
     PP_NaClFileInfo file_info = kInvalidNaClFileInfo;
     PP_FileHandle handle = GetReadonlyPnaclFd(url.c_str(),
                                               false /* is_executable */,
                                               &file_info.token_lo,
                                               &file_info.token_hi);
     if (handle == PP_kInvalidFileHandle) {
       base::ThreadTaskRunnerHandle::Get()->PostTask(
           FROM_HERE, base::Bind(callback, static_cast<int32_t>(PP_ERROR_FAILED),
                                 kInvalidNaClFileInfo));
       return;
@@ skipping 260 matching lines @@
   // Mark the request as requesting a PNaCl bitcode file,
   // so that component updater can detect this user action.
   url_request.addHTTPHeaderField(
       blink::WebString::fromUTF8("Accept"),
       blink::WebString::fromUTF8("application/x-pnacl, */*"));
   url_request.setRequestContext(blink::WebURLRequest::RequestContextObject);
   downloader->Load(url_request);
 }
 
 }  // namespace nacl