Revert 162856 "Revert 162842 "Replace MakeWeak with SetWeak API in DOMWrapperMap""

>    > Replace MakeWeak with SetWeak API in DOMWrapperMap
>   >
>    > BUG=324225
>    > R=marja@chromium.org
>    >
>    > Review URL: https://codereview.chromium.org/95003003
>
>    TBR=jochen@chromium.org
>
>    Review URL: https://codereview.chromium.org/95753002

R=dcarney@chromium.org

Review URL: https://codereview.chromium.org/94193004

git-svn-id: svn://svn.chromium.org/blink/trunk@162904 bbb929c8-8fbe-4397-9dbb-9b2b20218538