Revert of Use std::unique_ptr.

src/pdf/SkPDFDevice.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPDFDevice.h"
 
 #include "SkAnnotationKeys.h"
@@ skipping 1515 matching lines @@
 sk_sp<SkPDFArray> SkPDFDevice::copyMediaBox() const {
     auto mediaBox = sk_make_sp<SkPDFArray>();
     mediaBox->reserve(4);
     mediaBox->appendInt(0);
     mediaBox->appendInt(0);
     mediaBox->appendInt(fPageSize.width());
     mediaBox->appendInt(fPageSize.height());
     return mediaBox;
 }
 
-std::unique_ptr<SkStreamAsset> SkPDFDevice::content() const {
+skstd::unique_ptr<SkStreamAsset> SkPDFDevice::content() const {
     SkDynamicMemoryWStream buffer;
     this->writeContent(&buffer);
-    return std::unique_ptr<SkStreamAsset>(
+    return skstd::unique_ptr<SkStreamAsset>(
             buffer.bytesWritten() > 0
             ? buffer.detachAsStream()
             : new SkMemoryStream);
 }
 
 void SkPDFDevice::copyContentEntriesToData(ContentEntry* entry,
         SkWStream* data) const {
     // TODO(ctguil): For margins, I'm not sure fExistingClipStack/Region is the
     // right thing to pass here.
     GraphicStackState gsState(fExistingClipStack, fExistingClipRegion, data);
@@ skipping 779 matching lines @@
         pdfimage.reset(SkPDFCreateBitmapObject(
                                image, fCanon->getPixelSerializer()));
         if (!pdfimage) {
             return;
         }
         fCanon->addPDFBitmap(image->uniqueID(), pdfimage.get());
     }
     SkPDFUtils::DrawFormXObject(this->addXObjectResource(pdfimage.get()),
                                 &content.entry()->fContent);
 }