Make SpdyHeaderBlock non-copyable.

net/spdy/spdy_header_block_test.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 <memory>
 #include <utility>
 
 #include "base/values.h"
@@ skipping 78 matching lines @@
   string qux("qux");
   EXPECT_EQ("qux2", block1[qux]);
   EXPECT_EQ("qux2", block1.GetHeader(qux));
   EXPECT_EQ(Pair("key", "value"), *block1.find("key"));
 
   block1.erase("key");
   EXPECT_EQ(block1.end(), block1.find("key"));
   EXPECT_EQ("", block1.GetHeader("key"));
 }
 
-// This test verifies that SpdyHeaderBlock can be copied.
+// This test verifies that SpdyHeaderBlock can be copied using Clone().
 TEST(SpdyHeaderBlockTest, CopyBlocks) {
   SpdyHeaderBlock block1;
   block1["foo"] = string(300, 'x');
   block1["bar"] = "baz";
   block1.ReplaceOrAppendHeader("qux", "qux1");
 
-  SpdyHeaderBlock block2;
-  block2 = block1;
-
-  SpdyHeaderBlock block3(block1);
+  SpdyHeaderBlock block2 = block1.Clone();
+  SpdyHeaderBlock block3(block1.Clone());
 
   EXPECT_EQ(block1, block2);
   EXPECT_EQ(block1, block3);
 }
 
 TEST(SpdyHeaderBlockTest, ToNetLogParamAndBackAgain) {
   SpdyHeaderBlock headers;
   headers["A"] = "a";
   headers["B"] = "b";
 
@@ skipping 18 matching lines @@
 
   EXPECT_EQ(block1, block2);
   EXPECT_NE(block1, block3);
 
   block2["baz"] = "qux";
   EXPECT_NE(block1, block2);
 }
 
 }  // namespace test
 }  // namespace net