Remove <iostream> where possible.

net/tools/flip_server/balsa_headers.h

 // Copyright (c) 2009 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.
 
 #ifndef NET_TOOLS_FLIP_SERVER_BALSA_HEADERS_H_
 #define NET_TOOLS_FLIP_SERVER_BALSA_HEADERS_H_
 
 #include <algorithm>
-#include <iostream>
+#include <iosfwd>
 #include <iterator>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/port.h"
 #include "base/logging.h"
 #include "base/string_piece.h"
 #include "net/tools/flip_server/balsa_enums.h"
 #include "net/tools/flip_server/string_piece_utils.h"
@@ skipping 443 matching lines @@
 
     bool operator>=(const self& it) const {
       return it <= *this;
     }
 
     // This mainly exists so that we can have interesting output for
     // unittesting. The EXPECT_EQ, EXPECT_NE functions require that
     // operator<< work for the classes it sees.  It would be better if there
     // was an additional traits-like system for the gUnit output... but oh
     // well.
-    friend std::ostream& operator<<(std::ostream& os, const iterator_base& it) {
-      os << "[" << it.headers_ << ", " << it.idx_ << "]";
-      return os;
-    }
+    std::ostream& operator<<(std::ostream& os, const iterator_base& it);
 
    protected:
     iterator_base(const BalsaHeaders* headers, HeaderLines::size_type index) :
         headers_(headers),
         idx_(index) {}
 
     void increment() {
       const HeaderLines& header_lines = headers_->header_lines_;
       const HeaderLines::size_type header_lines_size = header_lines.size();
       const HeaderLines::size_type original_idx = idx_;
@@ skipping 788 matching lines @@
 
   bool transfer_encoding_is_chunked_;
 
   HeaderLines header_lines_;
 };
 
 }  // namespace net
 
 #endif  // NET_TOOLS_FLIP_SERVER_BALSA_HEADERS_H_