remove legacy code from PlatformCanvas days

remove legacy code from PlatformCanvas days

According to the comment, this extra copy was needed when the bitmaps in a platform-canvas
wasn't ref-countable. That is no longer the case (hasn't been true for quite a while AFAIK)
so this CL removes that code.

BUG=

Review-Url: https://codereview.chromium.org/2799283003
Cr-Commit-Position: refs/heads/master@{#462845}
Committed: https://chromium.googlesource.com/chromium/src/+/0551782d3e45a41949e2508c912acc7800cd4fad

[reed1, 2017-04-06 18:14:27]

The CQ bit was checked by reed@google.com to run a CQ dry run

[reed1, 2017-04-06 18:15:55]

reed@google.com changed reviewers:
+ jochen@chromium.org

[commit-bot: I haz the power, 2017-04-06 18:16:08]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[reed1, 2017-04-06 18:17:12]

reed@google.com changed reviewers:
+ motek@chromium.org

[commit-bot: I haz the power, 2017-04-06 20:35:10]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-04-06 20:35:10]

Dry run: This issue passed the CQ dry run.

[jochen (gone - plz use gerrit), 2017-04-07 07:00:17]

lgtm

[reed1, 2017-04-07 12:32:43]

The CQ bit was checked by reed@google.com

[commit-bot: I haz the power, 2017-04-07 12:32:59]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-04-07 12:39:48]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1491568363164920, "parent_rev":
"69cffb5b42a7750fad55fd52c034573268e29681", "commit_rev":
"0551782d3e45a41949e2508c912acc7800cd4fad"}

[commit-bot: I haz the power, 2017-04-07 12:40:42]

Description was changed from

==========
remove legacy code from PlatformCanvas days

According to the comment, this extra copy was needed when the bitmaps in a
platform-canvas
wasn't ref-countable. That is no longer the case (hasn't been true for quite a
while AFAIK)
so this CL removes that code.

BUG=
==========

to

==========
remove legacy code from PlatformCanvas days

According to the comment, this extra copy was needed when the bitmaps in a
platform-canvas
wasn't ref-countable. That is no longer the case (hasn't been true for quite a
while AFAIK)
so this CL removes that code.

BUG=

Review-Url: https://codereview.chromium.org/2799283003
Cr-Commit-Position: refs/heads/master@{#462845}
Committed:
https://chromium.googlesource.com/chromium/src/+/0551782d3e45a41949e2508c912a...
==========

[commit-bot: I haz the power, 2017-04-07 12:40:45]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/0551782d3e45a41949e2508c912a...