Suppress lint warning "SdCardPath" for getRawAcceptableDirectories()

Suppress lint warning "SdCardPath" for getRawAcceptableDirectories()

The following lint warnings are issued every time when chrome/content
shell is built

../../../tmp/tmp6VcHbX/0/MediaResourceGetter.java:365 Do not hardcode "/sdcard/";
 use Environment.getExternalStorageDirectory().getPath() instead: SdCardPath [warning]
        result.add("/mnt/sdcard/");
                   ~~~~~~~~~~~~~~
../../../tmp/tmp6VcHbX/0/MediaResourceGetter.java:366 Do not hardcode "/sdcard/";
 use Environment.getExternalStorageDirectory().getPath() instead: SdCardPath [warning]
        result.add("/sdcard/");
                   ~~~~~~~~~~
../../../tmp/tmp6VcHbX/0/MediaResourceGetter.java:367 Do not hardcode "/data/";
 use Context.getFilesDir().getPath() instead: SdCardPath [warning]
        result.add("/data/data/" + context.getPackageName() + "/cache/");

As these hardcoded values are required and the warnings here are false positives
which are more explained in https://codereview.chromium.org/561743003/#msg5

BUG=None.

Committed: https://crrev.com/c286ceeed3e28d21603dcb0888109331bab7a7be
Cr-Commit-Position: refs/heads/master@{#296891}

[wajahat, 2014-09-25 15:02:26]

wajahat.s@samsung.com changed reviewers:
+ andrewhayden@chromium.org, tedchoc@chromium.org

[wajahat, 2014-09-25 15:02:27]

Pl. review, Thanks!

[Ted C, 2014-09-25 17:09:42]

lgtm

[Andrew Hayden (chromium.org), 2014-09-25 22:14:53]

LGTM as well.

[wajahat, 2014-09-26 04:25:05]

The CQ bit was checked by wajahat.s@samsung.com

[commit-bot: I haz the power, 2014-09-26 04:25:28]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/597283007/1

[commit-bot: I haz the power, 2014-09-26 05:41:19]

Committed patchset #1 (id:1) as aef166811456e4f9c9609dcc5d2a47ddef48ef1e

[commit-bot: I haz the power, 2014-09-26 05:41:53]

Patchset 1 (id:??) landed as
https://crrev.com/c286ceeed3e28d21603dcb0888109331bab7a7be
Cr-Commit-Position: refs/heads/master@{#296891}