Revert of Remove WebInspector.HeapSnapshotArraySlice (https://codereview.chromium.org/204563002/)

Reason for revert:
Made tests start failing

http://test-results.appspot.com/dashboards/flakiness_dashboard.html#group=%40ToT%20Blink&tests=inspector-protocol/heap-profiler/heap-snapshot-with-detached-dom-tree.html,inspector-protocol/heap-profiler/heap-snapshot-with-event-listener.html

Original issue's description:
> Remove WebInspector.HeapSnapshotArraySlice
> 
> Uin32Array already has subarray method that returns a new view for the same array buffer.
> 
> BUG=None
> R=alph@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=169554

TBR=alph@chromium.org,loislo@chromium.org,yurys@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=None

Review URL: https://codereview.chromium.org/205953002

git-svn-id: svn://svn.chromium.org/blink/trunk@169599 bbb929c8-8fbe-4397-9dbb-9b2b20218538