Fix find-in-page "1 of 0" bug.

Fix find-in-page "1 of 0" bug.

This patch enabled FindRequestManager to update the active match ordinal
properly when all matches are dynamically removed from the page between
subsequent find requests.

BUG=707798
Review-Url: https://codereview.chromium.org/2790213002
Cr-Commit-Position: refs/heads/master@{#461522}
(cherry picked from commit 0f4e7a51e872861c59e466cbb498caa4ea54b808)

Review-Url: https://codereview.chromium.org/2802283002 .
Cr-Commit-Position: refs/branch-heads/3029@{#625}
Cr-Branched-From: 939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed: https://chromium.googlesource.com/chromium/src/+/78afc8b02f24bd416c58f4c4d58c3bf0c0c7f8b8

[paulmeyer, 2017-04-07 18:17:42]

Description was changed from

==========
Fix find-in-page "1 of 0" bug.

This patch enabled FindRequestManager to update the active match ordinal
properly when all matches are dynamically removed from the page between
subsequent find requests.

BUG=707798

Review-Url: https://codereview.chromium.org/2790213002
Cr-Commit-Position: refs/heads/master@{#461522}
(cherry picked from commit 0f4e7a51e872861c59e466cbb498caa4ea54b808)
==========

to

==========
Fix find-in-page "1 of 0" bug.

This patch enabled FindRequestManager to update the active match ordinal
properly when all matches are dynamically removed from the page between
subsequent find requests.

BUG=707798

Review-Url: https://codereview.chromium.org/2790213002
Cr-Commit-Position: refs/heads/master@{#461522}
(cherry picked from commit 0f4e7a51e872861c59e466cbb498caa4ea54b808)

Review-Url: https://codereview.chromium.org/2802283002 .
Cr-Commit-Position: refs/branch-heads/3029@{#625}
Cr-Branched-From:
939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed:
https://chromium.googlesource.com/chromium/src/+/78afc8b02f24bd416c58f4c4d58c...
==========

[paulmeyer, 2017-04-07 18:17:44]

Committed patchset #1 (id:1) manually as
78afc8b02f24bd416c58f4c4d58c3bf0c0c7f8b8.