Save some gcc footprint (15 KB) in ExplodedFrameState.

content/common/page_state_serialization.h

 // Copyright 2013 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 CONTENT_COMMON_PAGE_STATE_SERIALIZATION_H_
 #define CONTENT_COMMON_PAGE_STATE_SERIALIZATION_H_
 
 #include <vector>
 
 #include "base/strings/nullable_string16.h"
@@ skipping 40 matching lines @@
   gfx::PointF pinch_viewport_scroll_offset;
   gfx::Point scroll_offset;
   int64 item_sequence_number;
   int64 document_sequence_number;
   double page_scale_factor;
   blink::WebReferrerPolicy referrer_policy;
   ExplodedHttpBody http_body;
   std::vector<ExplodedFrameState> children;
 
   ExplodedFrameState();
+  ExplodedFrameState(const ExplodedFrameState& other);
   ~ExplodedFrameState();
+  void operator=(const ExplodedFrameState& other);
+
+private:
+  void assign(const ExplodedFrameState& other);
 };
 
 struct CONTENT_EXPORT ExplodedPageState {
   std::vector<base::NullableString16> referenced_files;
   ExplodedFrameState top;
 
   ExplodedPageState();
   ~ExplodedPageState();
 };
 
 CONTENT_EXPORT bool DecodePageState(const std::string& encoded,
                                     ExplodedPageState* exploded);
 CONTENT_EXPORT bool EncodePageState(const ExplodedPageState& exploded,
                                     std::string* encoded);
 
 #if defined(OS_ANDROID)
 CONTENT_EXPORT bool DecodePageStateWithDeviceScaleFactorForTesting(
     const std::string& encoded,
     float device_scale_factor,
     ExplodedPageState* exploded);
 #endif
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_PAGE_STATE_SERIALIZATION_H_