Make SpdyHeaderBlock non-copyable.

net/spdy/spdy_protocol.h

 // Copyright (c) 2012 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.
 
 // This file contains some protocol structures for use with SPDY 3 and HTTP 2
 // The SPDY 3 spec can be found at:
 // http://dev.chromium.org/spdy/spdy-protocol/spdy-protocol-draft3
 
 #ifndef NET_SPDY_SPDY_PROTOCOL_H_
 #define NET_SPDY_SPDY_PROTOCOL_H_
@@ skipping 700 matching lines @@
 };
 
 // Abstract class intended to be inherited by IRs that contain a header
 // block. Implies SpdyFrameWithFinIR.
 class NET_EXPORT_PRIVATE SpdyFrameWithHeaderBlockIR
     : public NON_EXPORTED_BASE(SpdyFrameWithFinIR) {
  public:
   ~SpdyFrameWithHeaderBlockIR() override;
 
   const SpdyHeaderBlock& header_block() const { return header_block_; }
-  void set_header_block(const SpdyHeaderBlock& header_block) {
+  void set_header_block(SpdyHeaderBlock header_block) {
     // Deep copy.
-    header_block_ = header_block;
+    header_block_ = std::move(header_block);
   }
   void SetHeader(base::StringPiece name, base::StringPiece value) {
     header_block_[name] = value;
   }
 
  protected:
   SpdyFrameWithHeaderBlockIR(SpdyStreamId stream_id,
                              SpdyHeaderBlock header_block);
 
  private:
@@ skipping 496 matching lines @@
   SpdyFrameVisitor() {}
   virtual ~SpdyFrameVisitor() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SpdyFrameVisitor);
 };
 
 }  // namespace net
 
 #endif  // NET_SPDY_SPDY_PROTOCOL_H_