[App banners] Stop passing JNI barrier to get icon size

[App banners] Stop passing JNI barrier to get icon size

Also deletes a bunch of comments that no longer apply and need to
be rewritten.

BUG=457413
Committed: https://crrev.com/8d2211bf7e80df7d4fdd1d038e9424bd15268aa2
Cr-Commit-Position: refs/heads/master@{#316960}

[gone, 2015-02-19 00:14:01]

dfalcantara@chromium.org changed reviewers:
+ tedchoc@chromium.org

[Ted C, 2015-02-19 00:19:21]

lgtm

[gone, 2015-02-19 00:21:21]

The CQ bit was checked by dfalcantara@chromium.org

[commit-bot: I haz the power, 2015-02-19 00:22:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/932263002/1

[commit-bot: I haz the power, 2015-02-19 01:06:25]

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

[commit-bot: I haz the power, 2015-02-19 01:06:27]

Try jobs failed on following builders:
  win_chromium_compile_dbg_ng on tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_comp...)

[gone, 2015-02-19 01:06:54]

The CQ bit was checked by dfalcantara@chromium.org

[commit-bot: I haz the power, 2015-02-19 01:07:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/932263002/1

[gone, 2015-02-19 01:08:02]

The CQ bit was unchecked by dfalcantara@chromium.org

[gone, 2015-02-19 01:09:17]

New patchsets have been uploaded after l-g-t-m from tedchoc@chromium.org

[gone, 2015-02-19 01:09:29]

The CQ bit was checked by dfalcantara@chromium.org

[commit-bot: I haz the power, 2015-02-19 01:10:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/932263002/20001

[commit-bot: I haz the power, 2015-02-19 01:41:15]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-02-19 01:41:58]

Patchset 2 (id:??) landed as
https://crrev.com/8d2211bf7e80df7d4fdd1d038e9424bd15268aa2
Cr-Commit-Position: refs/heads/master@{#316960}