Fix extraneous beeps on empty page search.

Fix extraneous beeps on empty page search.

As of https://crrev.com/3ac612d592cd42355a432c8d307051d299d79768 a
find-in-page can issue multiple "final updates" if the document changes.
Each time a final update with zero results occurs, there is an audbible
notification which is a nuisance beyond the first one. Particularly
bothersome is that most or all pages cause a ding as you close them if
they have an active find in page with zero results.

BUG=682299
Review-Url: https://codereview.chromium.org/2839713002
Cr-Commit-Position: refs/heads/master@{#467417}
(cherry picked from commit 59192dd2dd5d23372ca3ace498327f1c690e61ac)

Review-Url: https://codereview.chromium.org/2858153005 .
Cr-Commit-Position: refs/branch-heads/3071@{#419}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/b5cf4cfcefca6ace80f3b64dae5186f86092d54c

[Sigurður Ásgeirsson, 2017-05-05 17:20:36]

Description was changed from

==========
Fix extraneous beeps on empty page search.

As of https://crrev.com/3ac612d592cd42355a432c8d307051d299d79768 a
find-in-page can issue multiple "final updates" if the document changes.
Each time a final update with zero results occurs, there is an audbible
notification which is a nuisance beyond the first one. Particularly
bothersome is that most or all pages cause a ding as you close them if
they have an active find in page with zero results.

BUG=682299

Review-Url: https://codereview.chromium.org/2839713002
Cr-Commit-Position: refs/heads/master@{#467417}
(cherry picked from commit 59192dd2dd5d23372ca3ace498327f1c690e61ac)
==========

to

==========
Fix extraneous beeps on empty page search.

As of https://crrev.com/3ac612d592cd42355a432c8d307051d299d79768 a
find-in-page can issue multiple "final updates" if the document changes.
Each time a final update with zero results occurs, there is an audbible
notification which is a nuisance beyond the first one. Particularly
bothersome is that most or all pages cause a ding as you close them if
they have an active find in page with zero results.

BUG=682299

Review-Url: https://codereview.chromium.org/2839713002
Cr-Commit-Position: refs/heads/master@{#467417}
(cherry picked from commit 59192dd2dd5d23372ca3ace498327f1c690e61ac)

Review-Url: https://codereview.chromium.org/2858153005 .
Cr-Commit-Position: refs/branch-heads/3071@{#419}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/b5cf4cfcefca6ace80f3b64dae51...
==========

[Sigurður Ásgeirsson, 2017-05-05 17:20:37]

Committed patchset #1 (id:1) manually as
b5cf4cfcefca6ace80f3b64dae5186f86092d54c.