Make updateMarkerRenderedRect() to dispose temporary Range object after use

Make updateMarkerRenderedRect() to dispose temporary Range object after use

This patch makes |updateMarkerRenderedRect()| in |DocumentMarkerController| to
dispose temporary |Range| object after use to prevent increasing number of
active |Range| object for avoiding slow down of DOM mutation operations.

Note: This patch is a temporary solution, we'll have |EphemeralRange| version
later.

BUG=613658
TEST=n/a; This is temporary solution, we'll have another solution later.

Review-Url: https://codereview.chromium.org/2034753003
Cr-Commit-Position: refs/heads/master@{#397626}
(cherry picked from commit 544e48708ee9286a58dfa24e0f29e30cece34f3c)

Committed: https://chromium.googlesource.com/chromium/src/+/803a3ac5b77116151f02189ede18b22731de4579

[haraken, 2016-06-04 00:47:00]

Description was changed from

==========
Make updateMarkerRenderedRect() to dispose temporary Range object after use

This patch makes |updateMarkerRenderedRect()| in |DocumentMarkerController| to
dispose temporary |Range| object after use to prevent increasing number of
active |Range| object for avoiding slow down of DOM mutation operations.

Note: This patch is a temporary solution, we'll have |EphemeralRange| version
later.

BUG=613658
TEST=n/a; This is temporary solution, we'll have another solution later.

Review-Url: https://codereview.chromium.org/2034753003
Cr-Commit-Position: refs/heads/master@{#397626}
(cherry picked from commit 544e48708ee9286a58dfa24e0f29e30cece34f3c)
==========

to

==========
Make updateMarkerRenderedRect() to dispose temporary Range object after use

This patch makes |updateMarkerRenderedRect()| in |DocumentMarkerController| to
dispose temporary |Range| object after use to prevent increasing number of
active |Range| object for avoiding slow down of DOM mutation operations.

Note: This patch is a temporary solution, we'll have |EphemeralRange| version
later.

BUG=613658
TEST=n/a; This is temporary solution, we'll have another solution later.

Review-Url: https://codereview.chromium.org/2034753003
Cr-Commit-Position: refs/heads/master@{#397626}
(cherry picked from commit 544e48708ee9286a58dfa24e0f29e30cece34f3c)

Committed:
https://chromium.googlesource.com/chromium/src/+/803a3ac5b77116151f02189ede18...
==========

[haraken, 2016-06-04 00:47:02]

Committed patchset #1 (id:1) manually as
803a3ac5b77116151f02189ede18b22731de4579.