[refactor] Replace custom utility function with base's "vector_as_array()"

content/child/webcrypto/webcrypto_impl.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 "content/child/webcrypto/webcrypto_impl.h"
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/single_thread_task_runner.h"
+#include "base/stl_util.h"
 #include "base/task_runner.h"
 #include "base/thread_task_runner_handle.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "base/threading/worker_pool.h"
 #include "content/child/webcrypto/algorithm_dispatch.h"
 #include "content/child/webcrypto/crypto_data.h"
 #include "content/child/webcrypto/status.h"
 #include "content/child/webcrypto/structured_clone.h"
 #include "content/child/webcrypto/webcrypto_util.h"
 #include "content/child/worker_thread_task_runner.h"
@@ skipping 89 matching lines @@
                                const std::vector<uint8_t>& buffer,
                                blink::WebCryptoResult* result) {
   if (status.IsError()) {
     CompleteWithError(status, result);
   } else {
     if (buffer.size() > UINT_MAX) {
       // WebArrayBuffers have a smaller range than std::vector<>, so
       // theoretically this could overflow.
       CompleteWithError(Status::ErrorUnexpected(), result);
     } else {
-      result->completeWithBuffer(webcrypto::Uint8VectorStart(buffer),
-                                 buffer.size());
+      result->completeWithBuffer(vector_as_array(&buffer), buffer.size());
     }
   }
 }
 
 void CompleteWithKeyOrError(const Status& status,
                             const blink::WebCryptoKey& key,
                             blink::WebCryptoResult* result) {
   if (status.IsError()) {
     CompleteWithError(status, result);
   } else {
@@ skipping 340 matching lines @@
 void DoExportKeyReply(scoped_ptr<ExportKeyState> state) {
   if (state->format != blink::WebCryptoKeyFormatJwk) {
     CompleteWithBufferOrError(state->status, state->buffer, &state->result);
     return;
   }
 
   if (state->status.IsError()) {
     CompleteWithError(state->status, &state->result);
   } else {
     state->result.completeWithJson(
-        reinterpret_cast<const char*>(
-            webcrypto::Uint8VectorStart(&state->buffer)),
+        reinterpret_cast<const char*>(vector_as_array(&state->buffer)),
         state->buffer.size());
   }
 }
 
 void DoExportKey(scoped_ptr<ExportKeyState> passed_state) {
   ExportKeyState* state = passed_state.get();
   if (state->cancelled())
     return;
   state->status =
       webcrypto::ExportKey(state->format, state->key, &state->buffer);
@@ skipping 266 matching lines @@
       &key);
 }
 
 bool WebCryptoImpl::serializeKeyForClone(
     const blink::WebCryptoKey& key,
     blink::WebVector<unsigned char>& key_data) {
   return webcrypto::SerializeKeyForClone(key, &key_data);
 }
 
 }  // namespace content