Revert of Fix logic handling empty strings in tts.

Revert of Fix logic handling empty strings in tts. (patchset #1 id:1 of https://codereview.chromium.org/1762843002/ )

Reason for revert:
It turns out this causes Output.flushNextUtterance to not get applied correctly. Output sometimes sends an empty string as its first utterance.

Original issue's description:
> Fix logic handling empty strings in tts.
>
> Previously, we explicitly stopped speech when encountering a call to speak only whitespace. However, since sometimes we get whitespace from an unreliable source, it can actually cause other utterances to be interrupted.
>
> One such example is Sheets. When arrowing around, we observe some events resulting in empty speech which interrupts cell announcement.
>
> Committed: https://crrev.com/112cdcfa70a21b026abe0228c9b5ebb2fb287a3e
> Cr-Commit-Position: refs/heads/master@{#379308}

TBR=dmazzoni@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.

Committed: https://crrev.com/d9e1e17f95eda1e857322627b55c269cb48a60e9
Cr-Commit-Position: refs/heads/master@{#380231}

[David Tseng, 2016-03-08 20:13:59]

Created Revert of Fix logic handling empty strings in tts.

[commit-bot: I haz the power, 2016-03-08 20:14:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1770943004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1770943004/1

[commit-bot: I haz the power, 2016-03-08 20:31:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1770943004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1770943004/1

[commit-bot: I haz the power, 2016-03-08 20:47:35]

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

[commit-bot: I haz the power, 2016-03-08 20:47:36]

Try jobs failed on following builders:
  android_chromium_gn_compile_rel on tryserver.chromium.android (JOB_FAILED,
https://build.chromium.org/p/tryserver.chromium.android/builders/android_chro...)

[David Tseng, 2016-03-09 20:57:01]

The CQ bit was checked by dtseng@chromium.org

[commit-bot: I haz the power, 2016-03-09 20:59:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1770943004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1770943004/1

[commit-bot: I haz the power, 2016-03-09 21:45:41]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-09 21:46:49]

Description was changed from

==========
Revert of Fix logic handling empty strings in tts. (patchset #1 id:1 of
https://codereview.chromium.org/1762843002/ )

Reason for revert:
It turns out this causes Output.flushNextUtterance to not get applied correctly.
Output sometimes sends an empty string as its first utterance.

Original issue's description:
> Fix logic handling empty strings in tts.
> 
> Previously, we explicitly stopped speech when encountering a call to speak
only whitespace. However, since sometimes we get whitespace from an unreliable
source, it can actually cause other utterances to be interrupted.
> 
> One such example is Sheets. When arrowing around, we observe some events
resulting in empty speech which interrupts cell announcement.
> 
> Committed: https://crrev.com/112cdcfa70a21b026abe0228c9b5ebb2fb287a3e
> Cr-Commit-Position: refs/heads/master@{#379308}

TBR=dmazzoni@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
==========

to

==========
Revert of Fix logic handling empty strings in tts. (patchset #1 id:1 of
https://codereview.chromium.org/1762843002/ )

Reason for revert:
It turns out this causes Output.flushNextUtterance to not get applied correctly.
Output sometimes sends an empty string as its first utterance.

Original issue's description:
> Fix logic handling empty strings in tts.
>
> Previously, we explicitly stopped speech when encountering a call to speak
only whitespace. However, since sometimes we get whitespace from an unreliable
source, it can actually cause other utterances to be interrupted.
>
> One such example is Sheets. When arrowing around, we observe some events
resulting in empty speech which interrupts cell announcement.
>
> Committed: https://crrev.com/112cdcfa70a21b026abe0228c9b5ebb2fb287a3e
> Cr-Commit-Position: refs/heads/master@{#379308}

TBR=dmazzoni@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.

Committed: https://crrev.com/d9e1e17f95eda1e857322627b55c269cb48a60e9
Cr-Commit-Position: refs/heads/master@{#380231}
==========

[commit-bot: I haz the power, 2016-03-09 21:46:50]

Patchset 1 (id:??) landed as
https://crrev.com/d9e1e17f95eda1e857322627b55c269cb48a60e9
Cr-Commit-Position: refs/heads/master@{#380231}