A bit more privacy for SkiaServe's Request

tools/skiaserve/urlhandlers/ClipAlphaHandler.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "UrlHandler.h"
 
 #include "microhttpd.h"
 #include "../Request.h"
 #include "../Response.h"
 
 using namespace Response;
 
 bool ClipAlphaHandler::canHandle(const char* method, const char* url) {
     static const char* kBasePath = "/clipAlpha/";
     return 0 == strcmp(method, MHD_HTTP_METHOD_POST) &&
            0 == strncmp(url, kBasePath, strlen(kBasePath));
 }
 
 int ClipAlphaHandler::handle(Request* request, MHD_Connection* connection,
                              const char* url, const char* method,
                              const char* upload_data, size_t* upload_data_size) {
     SkTArray<SkString> commands;
     SkStrSplit(url, "/", &commands);
 
-    if (!request->fPicture.get() || commands.count() != 2) {
+    if (!request->hasPicture() || commands.count() != 2) {
         return MHD_NO;
     }
 
     int alpha;
     sscanf(commands[1].c_str(), "%d", &alpha);
 
     request->fDebugCanvas->setClipVizColor(SkColorSetARGB(alpha, 0, 0, 0));
     return SendOK(connection);
 }