Clean up Android default command line flags.

Clean up Android default command line flags.

- New flags --enable-touch-events, --enable-pinch,
  --enable-gesture-tap-highlight.

- Remove Pepper-related flags.  If we add support for Pepper in the
  future it's better to start from a clean slate anyway.

- Remove --graphics-mode flag; currently only one mode works, and we won't
  be using it for changing modes in the future.

BUG=


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=159561

[aelias_OOO_until_Jul13, 2012-09-29 00:41:50]

I went into the Android default flags file to add
--enable-gesture-tap-highlight, and took the opportunity to remove a lot of old
flags that accumulated there.

[Jói, 2012-10-01 10:32:41]

LGTM for content/public (other bits too, but Yaron is a better reviewer for
those).

[Yaron, 2012-10-01 16:04:38]

lgtm

[commit-bot: I haz the power, 2012-10-01 16:12:13]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/aelias@chromium.org/11012003/1

[commit-bot: I haz the power, 2012-10-01 16:16:14]

Retried try job too often for step(s) compile

[commit-bot: I haz the power, 2012-10-01 16:54:33]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/aelias@chromium.org/11012003/6003

[commit-bot: I haz the power, 2012-10-01 17:00:02]

Retried try job too often for step(s) compile

[commit-bot: I haz the power, 2012-10-01 18:36:46]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/aelias@chromium.org/11012003/6003

[commit-bot: I haz the power, 2012-10-01 21:26:43]

Change committed as 159561