Add more string_util functions to base namespace.

android_webview/native/aw_media_url_interceptor.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 "android_webview/common/url_constants.h"
 #include "android_webview/native/aw_media_url_interceptor.h"
 #include "base/android/apk_assets.h"
 #include "base/strings/string_util.h"
 #include "content/public/common/url_constants.h"
 
 namespace android_webview {
 
 bool AwMediaUrlInterceptor::Intercept(const std::string& url,
-              int* fd, int64* offset, int64* size) const{
-  const std::string asset_file_prefix(
-      std::string(url::kFileScheme) +
-      std::string(url::kStandardSchemeSeparator) +
-      android_webview::kAndroidAssetPath);
+                                      int* fd,
+                                      int64* offset,
+                                      int64* size) const{
+  std::string asset_file_prefix(url::kFileScheme);
+  asset_file_prefix.append(url::kStandardSchemeSeparator);
+  asset_file_prefix.append(android_webview::kAndroidAssetPath);
 
   if (base::StartsWithASCII(url, asset_file_prefix, true)) {
     std::string filename(url);
-    ReplaceFirstSubstringAfterOffset(
+    base::ReplaceFirstSubstringAfterOffset(
         &filename, 0, asset_file_prefix, "assets/");
     base::MemoryMappedFile::Region region =
         base::MemoryMappedFile::Region::kWholeFile;
     *fd = base::android::OpenApkAsset(filename, &region);
     *offset = region.offset;
     *size = region.size;
     return *fd != -1;
   }
 
   return false;
 }
 
 }  // namespace android_webview