Ensure that unique ids are unique.

content/browser/frame_host/navigation_entry_impl.cc

Index: content/browser/frame_host/navigation_entry_impl.cc
diff --git a/content/browser/frame_host/navigation_entry_impl.cc b/content/browser/frame_host/navigation_entry_impl.cc
index c2b7675519eedc753a6aaa720c64f54fb45f489f..282d860a45a8d9e3a8ebbd22dba8f09f9a30da9f 100644
--- a/content/browser/frame_host/navigation_entry_impl.cc
+++ b/content/browser/frame_host/navigation_entry_impl.cc
@@ -342,7 +342,7 @@ NavigationEntryImpl* NavigationEntryImpl::Clone() const {
   copy->frame_tree_.reset(frame_tree_->Clone());
 
   // Copy all state over, unless cleared in ResetForCommit.

[Peter Kasting, 2015/05/18 20:49:23]

Nit: all -> most

[Avi (use Gerrit), 2015/05/18 20:51:43]

Done.

-  copy->unique_id_ = unique_id_;
+  // Not unique_id_; even identical twins have different fingerprints.

[Peter Kasting, 2015/05/18 20:49:23]

Nit: Perhaps "Don't copy |unique_id_|, or it won't be unique."

[Avi (use Gerrit), 2015/05/18 20:51:43]

Done.

   copy->bindings_ = bindings_;
   copy->page_type_ = page_type_;
   copy->virtual_url_ = virtual_url_;