Revert of Use std::unique_ptr.

src/pdf/SkPDFDevice.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkPDFDevice_DEFINED
 #define SkPDFDevice_DEFINED
 
@@ skipping 150 matching lines @@
      *  @param dict  Dictionary to add destinations to.
      *  @param page  The PDF object representing the page for this device.
      */
     void appendDestinations(SkPDFDict* dict, SkPDFObject* page) const;
 
     /** Returns a copy of the media box for this device. */
     sk_sp<SkPDFArray> copyMediaBox() const;
 
     /** Returns a SkStream with the page contents.
      */
-    std::unique_ptr<SkStreamAsset> content() const;
+    skstd::unique_ptr<SkStreamAsset> content() const;
 
     /** Writes the page contents to the stream. */
     void writeContent(SkWStream*) const;
 
     const SkMatrix& initialTransform() const {
         return fInitialTransform;
     }
 
     /** Returns a SkPDFGlyphSetMap which represents glyph usage of every font
      *  that shows on this device.
@@ skipping 151 matching lines @@
 
     typedef SkBaseDevice INHERITED;
 
     // TODO(edisonn): Only SkDocument_PDF and SkPDFImageShader should be able to create
     // an SkPDFDevice
     //friend class SkDocument_PDF;
     //friend class SkPDFImageShader;
 };
 
 #endif