BlinkGCPlugin: Fix JSonWriter after Clang r234897

tools/clang/blink_gc_plugin/JsonWriter.h

 // 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.
 
 #ifndef TOOLS_BLINK_GC_PLUGIN_JSON_WRITER_H_
 #define TOOLS_BLINK_GC_PLUGIN_JSON_WRITER_H_
 
 #include "llvm/Support/raw_ostream.h"
 
 // Helper to write information for the points-to graph.
 class JsonWriter {
  public:
-  static JsonWriter* from(std::unique_ptr<llvm::raw_fd_ostream> os) {
+  static JsonWriter* from(std::unique_ptr<llvm::raw_ostream> os) {
     return os ? new JsonWriter(std::move(os)) : 0;
   }
   void OpenList() {
     Separator();
     *os_ << "[";
     state_.push(false);
   }
   void OpenList(const std::string key) {
     Write(key);
     *os_ << ":";
@@ skipping 22 matching lines @@
   }
   void Write(const std::string key, const size_t val) {
     Separator();
     *os_ << "\"" << key << "\":" << val;
   }
   void Write(const std::string key, const std::string val) {
     Separator();
     *os_ << "\"" << key << "\":\"" << val << "\"";
   }
  private:
-  JsonWriter(std::unique_ptr<llvm::raw_fd_ostream> os) : os_(std::move(os)) {}
+  JsonWriter(std::unique_ptr<llvm::raw_ostream> os) : os_(std::move(os)) {}
   void Separator() {
     if (state_.empty())
       return;
     if (state_.top()) {
       *os_ << ",";
       return;
     }
     state_.top() = true;
   }
-  std::unique_ptr<llvm::raw_fd_ostream> os_;
+  std::unique_ptr<llvm::raw_ostream> os_;
   std::stack<bool> state_;
 };
 
 #endif // TOOLS_BLINK_GC_PLUGIN_JSON_WRITER_H_