components: Add out-of-line copy ctors for complex classes.

components/query_parser/snippet.cc

 // Copyright 2014 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 "components/query_parser/snippet.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 
@@ skipping 190 matching lines @@
                                         &utf8_pos, &utf16_pos);
     i->second = AdvanceAndReturnUTF16Pos(utf8_cstring, utf8_length,
                                          static_cast<int32_t>(i->second),
                                          &utf8_pos, &utf16_pos);
   }
 }
 
 Snippet::Snippet() {
 }
 
+Snippet::Snippet(const Snippet& other) = default;
+
 Snippet::~Snippet() {
 }
 
 void Snippet::ComputeSnippet(const MatchPositions& match_positions,
                              const std::string& document) {
   // The length of snippets we try to produce.
   // We can generate longer snippets but stop once we cross kSnippetMaxLength.
   const size_t kSnippetMaxLength = 200;
   const base::string16 kEllipsis = base::ASCIIToUTF16(" ... ");
 
@@ skipping 74 matching lines @@
   utext_close(document_utext);
   swap(text_, snippet);
 }
 
 void Snippet::Swap(Snippet* other) {
   text_.swap(other->text_);
   matches_.swap(other->matches_);
 }
 
 }  // namespace query_parser