Make SpdyHeaderBlock non-copyable.

net/spdy/spdy_header_block.cc

 // 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.
 
 #include "net/spdy/spdy_header_block.h"
 
 #include <algorithm>
 #include <ios>
 #include <utility>
 #include <vector>
@@ skipping 102 matching lines @@
   return *this;
 }
 
 SpdyHeaderBlock::StringPieceProxy::operator StringPiece() const {
   return (lookup_result_ == block_->end()) ? StringPiece()
                                            : lookup_result_->second;
 }
 
 SpdyHeaderBlock::SpdyHeaderBlock() : storage_(new Storage) {}
 
-SpdyHeaderBlock::SpdyHeaderBlock(const SpdyHeaderBlock& other)
-    : storage_(new Storage) {
-  for (auto iter : other) {
-    AppendHeader(iter.first, iter.second);
-  }
-}
-
 SpdyHeaderBlock::SpdyHeaderBlock(SpdyHeaderBlock&& other)
     : storage_(std::move(other.storage_)) {
   // |block_| is linked_hash_map, which does not have move constructor.
   block_.swap(other.block_);
 }
 
 SpdyHeaderBlock::~SpdyHeaderBlock() {}
 
-SpdyHeaderBlock& SpdyHeaderBlock::operator=(const SpdyHeaderBlock& other) {
-  clear();
-  for (auto iter : other) {
-    AppendHeader(iter.first, iter.second);
-  }
-  return *this;
-}
-
 SpdyHeaderBlock& SpdyHeaderBlock::operator=(SpdyHeaderBlock&& other) {
   storage_ = std::move(other.storage_);
   // |block_| is linked_hash_map, which does not have move assignment
   // operator.
   block_.swap(other.block_);
   return *this;
 }
 
+SpdyHeaderBlock SpdyHeaderBlock::Clone() const {
+  SpdyHeaderBlock copy;
+  for (auto iter : *this) {
+    copy.AppendHeader(iter.first, iter.second);
+  }
+  return copy;
+}
+
 bool SpdyHeaderBlock::operator==(const SpdyHeaderBlock& other) const {
   return size() == other.size() && std::equal(begin(), end(), other.begin());
 }
 
 bool SpdyHeaderBlock::operator!=(const SpdyHeaderBlock& other) const {
   return !(operator==(other));
 }
 
 string SpdyHeaderBlock::DebugString() const {
   if (empty()) {
@@ skipping 95 matching lines @@
     if (!it.value().GetAsString(&value)) {
       headers->clear();
       return false;
     }
     (*headers)[it.key()] = value;
   }
   return true;
 }
 
 }  // namespace net