Fix a recent regression in Speech->Start Speaking on Mac

Fix a recent regression in Speech->Start Speaking on Mac

After a recent refactoring, all RenderWidgetHostViews use TextInputManager in
order to get the value of |selected_text_|. Unfortunately this was not applied
to SpeakText() call inside RenderWidgetHostViewMac and furthermore, the local
variable |selected_text_| was not removed from the view.

BUG=713850
Review-Url: https://codereview.chromium.org/2831183002
Cr-Commit-Position: refs/heads/master@{#466715}
(cherry picked from commit b69ac7cd2ccc200ff53b95b30cbbea962a27e0d3)

Review-Url: https://codereview.chromium.org/2842383002 .
Cr-Commit-Position: refs/branch-heads/3071@{#243}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/50b0fc38c86e7b9994db4d00c5e5e2247b972a2c

[EhsanK, 2017-04-27 00:04:16]

Description was changed from

==========
Fix a recent regression in Speech->Start Speaking on Mac

After a recent refactoring, all RenderWidgetHostViews use TextInputManager in
order to get the value of |selected_text_|. Unfortunately this was not applied
to SpeakText() call inside RenderWidgetHostViewMac and furthermore, the local
variable |selected_text_| was not removed from the view.

BUG=713850

Review-Url: https://codereview.chromium.org/2831183002
Cr-Commit-Position: refs/heads/master@{#466715}
(cherry picked from commit b69ac7cd2ccc200ff53b95b30cbbea962a27e0d3)
==========

to

==========
Fix a recent regression in Speech->Start Speaking on Mac

After a recent refactoring, all RenderWidgetHostViews use TextInputManager in
order to get the value of |selected_text_|. Unfortunately this was not applied
to SpeakText() call inside RenderWidgetHostViewMac and furthermore, the local
variable |selected_text_| was not removed from the view.

BUG=713850

Review-Url: https://codereview.chromium.org/2831183002
Cr-Commit-Position: refs/heads/master@{#466715}
(cherry picked from commit b69ac7cd2ccc200ff53b95b30cbbea962a27e0d3)

Review-Url: https://codereview.chromium.org/2842383002 .
Cr-Commit-Position: refs/branch-heads/3071@{#243}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/50b0fc38c86e7b9994db4d00c5e5...
==========

[EhsanK, 2017-04-27 00:04:18]

Committed patchset #1 (id:1) manually as
50b0fc38c86e7b9994db4d00c5e5e2247b972a2c.