Add more out of line copy ctors for complex classes.

content/browser/frame_host/frame_tree.cc

 // 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.
 
 #include "content/browser/frame_host/frame_tree.h"
 
 #include <stddef.h>
 
 #include <queue>
 #include <utility>
@@ skipping 65 matching lines @@
 }
 
 FrameTree::NodeIterator FrameTree::NodeRange::end() {
   return NodeIterator(nullptr, nullptr);
 }
 
 FrameTree::NodeRange::NodeRange(FrameTreeNode* root,
                                 FrameTreeNode* node_to_skip)
     : root_(root), node_to_skip_(node_to_skip) {}
 
+FrameTree::ConstNodeIterator::ConstNodeIterator(
+    const ConstNodeIterator& other) = default;
+
 FrameTree::ConstNodeIterator::~ConstNodeIterator() {}
 
 FrameTree::ConstNodeIterator& FrameTree::ConstNodeIterator::operator++() {
   for (size_t i = 0; i < current_node_->child_count(); ++i) {
     const FrameTreeNode* child = current_node_->child_at(i);
     queue_.push(child);
   }
 
   if (!queue_.empty()) {
     current_node_ = queue_.front();
@@ skipping 405 matching lines @@
   // This is only used to set page-level focus in cross-process subframes, and
   // requests to set focus in main frame's SiteInstance are ignored.
   if (instance != root_manager->current_frame_host()->GetSiteInstance()) {
     RenderFrameProxyHost* proxy =
         root_manager->GetRenderFrameProxyHost(instance);
     proxy->Send(new InputMsg_SetFocus(proxy->GetRoutingID(), is_focused));
   }
 }
 
 }  // namespace content