Hide isXXX() type checking methods in subclasses

Hide isXXX() type checking methods in subclasses

Hide isXXX() type checking methods in subclasses in order to catch unnecessary
calls at compile time. For e.g., it makes no sense to call
Element::isElementNode() as it is obviously true.

This CL also takes care of removing several such unnecessary calls that were
caught at compile time.

R=eseidel@chromium.org, pdr@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=178921

[pdr., 2014-07-25 08:47:22]

On 2014/07/25 04:10:50, Chris Dumez wrote:

LGTM.

[pdr., 2014-07-25 08:54:27]

The CQ bit was checked by pdr@chromium.org

[commit-bot: I haz the power, 2014-07-25 08:55:25]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/ch.dumez@samsung.com/422463002/1

[commit-bot: I haz the power, 2014-07-25 09:35:52]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/18925)

[commit-bot: I haz the power, 2014-07-25 10:04:53]

Change committed as 178921