Revert 257524 "Move IsStringASCII/UTF8 to base namespace."

trunk/src/content/renderer/media/webcontentdecryptionmodulesession_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 "content/renderer/media/webcontentdecryptionmodulesession_impl.h"
 
 #include "base/callback_helpers.h"
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 18 matching lines @@
 
 blink::WebString WebContentDecryptionModuleSessionImpl::sessionId() const {
   return web_session_id_;
 }
 
 void WebContentDecryptionModuleSessionImpl::initializeNewSession(
     const blink::WebString& mime_type,
     const uint8* init_data, size_t init_data_length) {
   // TODO(ddorwin): Guard against this in supported types check and remove this.
   // Chromium only supports ASCII MIME types.
-  if (!base::IsStringASCII(mime_type)) {
+  if (!IsStringASCII(mime_type)) {
     NOTREACHED();
     OnSessionError(media::MediaKeys::kUnknownError, 0);
     return;
   }
 
   adapter_->InitializeNewSession(
       session_id_, base::UTF16ToASCII(mime_type), init_data, init_data_length);
 }
 
 void WebContentDecryptionModuleSessionImpl::update(const uint8* response,
@@ skipping 36 matching lines @@
 }
 
 void WebContentDecryptionModuleSessionImpl::OnSessionError(
     media::MediaKeys::KeyError error_code,
     uint32 system_code) {
   client_->error(static_cast<Client::MediaKeyErrorCode>(error_code),
                  system_code);
 }
 
 }  // namespace content