[chromium] Remove XMLViewer.js/css post blink-in-js migration of XML tree viewer.

[chromium] Remove XMLViewer.js/css post blink-in-js migration of XML tree viewer.

CL, https://codereview.chromium.org/479753003, migrated the usage of XML tree viewer to
be implemented in blink-in-js. Post the migration, the files XMLViewer.js/css are no longer
used by any native code directly and hence should be removed.

Subsequent blink side CL would remove these files from the repository permanently.

TBR=jochen@chromium.org
NOTRY=true

Committed: https://crrev.com/9985c16ee7925937f69c9e320ba8409e0ac729c5
Cr-Commit-Position: refs/heads/master@{#293303}

[vivekg, 2014-09-03 18:56:58]

vivekg@chromium.org changed reviewers:
+ jochen@chromium.org, vivekg@chromium.org

[vivekg, 2014-09-03 18:56:58]

PTAL. We should commit this once the blink roll crosses 181328.

[vivekg, 2014-09-04 08:03:19]

vivekg@chromium.org changed reviewers:
+ haraken@chromium.org

[haraken, 2014-09-04 08:05:46]

LGTM

[vivekg, 2014-09-04 08:08:27]

The CQ bit was checked by vivekg@chromium.org

[commit-bot: I haz the power, 2014-09-04 08:09:35]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/vivek.vg@samsung.com/540493002/1

[jochen (gone - plz use gerrit), 2014-09-04 08:41:27]

lgtm

[commit-bot: I haz the power, 2014-09-04 08:56:41]

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

[commit-bot: I haz the power, 2014-09-04 08:56:42]

Try jobs failed on following builders:
  android_clang_dbg_recipe on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_clang_d...)

[vivekg, 2014-09-04 10:41:45]

The CQ bit was checked by vivekg@chromium.org

[commit-bot: I haz the power, 2014-09-04 10:43:03]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/vivek.vg@samsung.com/540493002/1

[vivekg, 2014-09-04 15:20:40]

The CQ bit was unchecked by vivekg@chromium.org

[vivekg, 2014-09-04 15:20:43]

The CQ bit was checked by vivekg@chromium.org

[commit-bot: I haz the power, 2014-09-04 15:23:47]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/vivek.vg@samsung.com/540493002/1

[commit-bot: I haz the power, 2014-09-04 15:26:41]

Committed patchset #1 (id:1) as 22b83e73f421506e024af89844da4d0a36a9dabe

[commit-bot: I haz the power, 2014-09-10 03:31:34]

Patchset 1 (id:??) landed as
https://crrev.com/9985c16ee7925937f69c9e320ba8409e0ac729c5
Cr-Commit-Position: refs/heads/master@{#293303}