Revert r158626 "Avoid copying a hash table bucket when inserting..."
Revert r158626 "Avoid copying a hash table bucket when inserting..."

The change causes crashes on Linux ASAN bots on
virtual/softwarecompositing/iframes/invisible* tests. Reverting fixed
the failures locally.

BUG=310975
TBR=dglazkov

Review URL: https://codereview.chromium.org/46043011

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@160809 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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