Revert 162897 "Remove deprecated call to 'Clear' from Source/bin..."

> Remove deprecated call to 'Clear' from Source/bindings/v8/NPV8Object.cpp.
> 
> BUG=324225
> R=dcarney@chromium.org
> 
> Review URL: https://codereview.chromium.org/96853002

TBR=mkwst@chromium.org

Review URL: https://codereview.chromium.org/96533005

git-svn-id: svn://svn.chromium.org/blink/trunk@162901 bbb929c8-8fbe-4397-9dbb-9b2b20218538