Cleanup <static_cast>: Switch to toFoo for Accessibility Objects.

Cleanup <static_cast>: Switch to toFoo for Accessibility Objects.

To enforce more strictly the avoidance of static_cast on render objects, existing usage of static_cast needs to be corrected first. 

R=tkent

BUG=None

TEST=None; no behavior changes;

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=158399

[r.kasibhatla, 2013-09-26 13:22:00]

PTAL.

[dmazzoni, 2013-09-26 15:04:38]

lgtm

[commit-bot: I haz the power, 2013-09-26 21:01:26]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/r.kasibhatla@samsung.com/24752002/1

[commit-bot: I haz the power, 2013-09-26 21:12:15]

Retried try job too often on blink_presubmit for step(s) presubmit
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=blink_pres...

[tkent, 2013-09-26 21:19:31]

Source/web lgtm.

[commit-bot: I haz the power, 2013-09-26 21:19:52]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/r.kasibhatla@samsung.com/24752002/1

[commit-bot: I haz the power, 2013-09-26 22:26:00]

Change committed as 158399