Migrate plugins to support new 'unobscured' rect interface

Migrate plugins to support new 'unobscured' rect interface

Blink defines a new WebPlugin interface here:

https://codereview.chromium.org/1033603007/

Currently both the deprecated and new versions are in the interface.
This patch removes the deprecated usages so we can remove it in Blink
as well.

BUG=468142
Committed: https://crrev.com/ec81b43b5849ed5663faba04a8ed742dd67f3e0d
Cr-Commit-Position: refs/heads/master@{#322839}

[tommycli, 2015-03-25 22:00:36]

tommycli@chromium.org changed reviewers:
+ piman@chromium.org

[piman, 2015-03-25 22:09:37]

lgtm

[tommycli, 2015-03-25 23:11:19]

tommycli@chromium.org changed reviewers:
+ bauerb@chromium.org

[tommycli, 2015-03-25 23:11:21]

bauerb: PTAL

This won't be sent to CQ until the Blink patch lands and is rolled.

[Bernhard Bauer, 2015-03-26 09:29:57]

lgtm

[tommycli, 2015-03-30 18:26:50]

The CQ bit was checked by tommycli@chromium.org

[commit-bot: I haz the power, 2015-03-30 18:27:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1023783008/60001

[commit-bot: I haz the power, 2015-03-30 19:42:20]

Committed patchset #4 (id:60001)

[commit-bot: I haz the power, 2015-03-30 19:43:05]

Patchset 4 (id:??) landed as
https://crrev.com/ec81b43b5849ed5663faba04a8ed742dd67f3e0d
Cr-Commit-Position: refs/heads/master@{#322839}