Renamed V8 private properties

This CL renames V8 private property names regarding to
V8EventListenerOrEventHandler.
This property is used in not only blink::V8EventListenerOrEventHandler
but also other classes (blink::V8EventListenerImpl,
blink::V8LazyEventListener, blink::V8EventListenerHelper).
These classes that is related to event listener is under redesigning
as described crbug.com/872138 and it is confusing to use
"V8EventListenerOrEventHandler" for the InterfaceName of private
properties.

Bug: 872138
Change-Id: I2509f60e7b527260b5f51a1e69305a53c3836302
Reviewed-on: https://chromium-review.googlesource.com/1206752
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Commit-Queue: Yuki Yamada <yukiy@google.com>
Cr-Commit-Position: refs/heads/master@{#589092}
3 files changed