Update refernces to Blink's Platform API (webkit)

webkit/media/crypto/key_systems.cc

 // Copyright (c) 2012 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 "webkit/media/crypto/key_systems.h"
 
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/string_util.h"
 #include "net/base/mime_util.h"
-#include "third_party/WebKit/Source/Platform/chromium/public/WebCString.h"
-#include "third_party/WebKit/Source/Platform/chromium/public/WebString.h"
+#include "third_party/WebKit/public/platform/WebCString.h"
+#include "third_party/WebKit/public/platform/WebString.h"
 #include "webkit/media/crypto/key_systems_info.h"
 
 namespace webkit_media {
 
 // Convert a WebString to ASCII, falling back on an empty string in the case
 // of a non-ASCII string.
 static std::string ToASCIIOrEmpty(const WebKit::WebString& string) {
   return IsStringASCII(string) ? UTF16ToASCII(string) : std::string();
 }
 
@@ skipping 129 matching lines @@
   for (int i = 0; i < kNumKeySystemToPepperTypeMapping; ++i) {
     if (kKeySystemToPepperTypeMapping[i].key_system == key_system)
       return kKeySystemToPepperTypeMapping[i].type;
   }
 
   return std::string();
 }
 #endif  // defined(ENABLE_PEPPER_CDMS)
 
 }  // namespace webkit_media