Convert //media/blink from scoped_ptr to std::unique_ptr

media/blink/url_index.cc

Index: media/blink/url_index.cc
diff --git a/media/blink/url_index.cc b/media/blink/url_index.cc
index 5f3f6f63698d1447c26e2e43b1a095ef7547ae47..b828b9a670704d50d3843e926fe78bd6529749a0 100644
--- a/media/blink/url_index.cc
+++ b/media/blink/url_index.cc
@@ -22,12 +22,12 @@ ResourceMultiBuffer::ResourceMultiBuffer(UrlData* url_data, int block_shift)
 
 ResourceMultiBuffer::~ResourceMultiBuffer() {}
 
-scoped_ptr<MultiBuffer::DataProvider> ResourceMultiBuffer::CreateWriter(
+std::unique_ptr<MultiBuffer::DataProvider> ResourceMultiBuffer::CreateWriter(
     const MultiBufferBlockId& pos) {
   ResourceMultiBufferDataProvider* ret =
       new ResourceMultiBufferDataProvider(url_data_, pos);
   ret->Start();
-  return scoped_ptr<MultiBuffer::DataProvider>(ret);
+  return std::unique_ptr<MultiBuffer::DataProvider>(ret);
 }
 
 bool ResourceMultiBuffer::RangeSupported() const {