Rename chrome/android/javatests to javatests_shell.

Rename chrome/android/javatests to javatests_shell.

The new name indicates that the tests are using chrome_shell. Future
tests will live in the javatests folder and won't be based on
chrome_shell.

BUG=484934
NOPRESUBMIT=true

Committed: https://crrev.com/8ce5ddaeb069d0855a128f1df186866bbd0d5b8e
Cr-Commit-Position: refs/heads/master@{#329532}

[newt (away), 2015-05-12 00:36:15]

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

[newt (away), 2015-05-12 00:36:18]

PTAL

[newt (away), 2015-05-12 00:38:04]

Simple move. Only interesting changes:
 - chrome/android/BUILD.gn
 - chrome/chrome_tests.gypi

[Ted C, 2015-05-12 00:38:59]

On 2015/05/12 00:36:18, newt wrote:
> PTAL

lgtm

[newt (away), 2015-05-12 00:39:21]

The CQ bit was checked by newt@chromium.org

[newt (away), 2015-05-12 00:39:34]

The CQ bit was unchecked by newt@chromium.org

[newt (away), 2015-05-12 00:45:30]

The CQ bit was checked by newt@chromium.org

[commit-bot: I haz the power, 2015-05-12 00:47:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1139643006/1

[commit-bot: I haz the power, 2015-05-12 01:01:10]

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

[commit-bot: I haz the power, 2015-05-12 01:01:13]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[newt (away), 2015-05-12 22:47:04]

The CQ bit was checked by newt@chromium.org

[newt (away), 2015-05-12 22:47:06]

The patchset sent to the CQ was uploaded after l-g-t-m from tedchoc@chromium.org
Link to the patchset: https://codereview.chromium.org/1139643006/#ps20001
(title: "rebase")

[commit-bot: I haz the power, 2015-05-12 22:47:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1139643006/20001

[commit-bot: I haz the power, 2015-05-12 23:59:18]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-05-13 00:00:18]

Patchset 2 (id:??) landed as
https://crrev.com/8ce5ddaeb069d0855a128f1df186866bbd0d5b8e
Cr-Commit-Position: refs/heads/master@{#329532}