Fix appinstalled event firing when user opens a WebAPK from banner.

Fix appinstalled event firing when user opens a WebAPK from banner.

The "Open" button was calling SendBannerAccepted, which made the
assumption that the app was being installed. Removed this call and
documented the method's semantics.

BUG=716313
Review-Url: https://codereview.chromium.org/2848703005
Cr-Commit-Position: refs/heads/master@{#467903}
(cherry picked from commit d398f548f1929bf2a8307d02bc69065cd7cdc035)

Review-Url: https://codereview.chromium.org/2851223003 .
Cr-Commit-Position: refs/branch-heads/3071@{#339}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/68c2976343b37ebe1568ccc566fe8c72ab74a795

[Matt Giuca, 2017-05-02 04:06:58]

Description was changed from

==========
Fix appinstalled event firing when user opens a WebAPK from banner.

The "Open" button was calling SendBannerAccepted, which made the
assumption that the app was being installed. Removed this call and
documented the method's semantics.

BUG=716313

Review-Url: https://codereview.chromium.org/2848703005
Cr-Commit-Position: refs/heads/master@{#467903}
(cherry picked from commit d398f548f1929bf2a8307d02bc69065cd7cdc035)
==========

to

==========
Fix appinstalled event firing when user opens a WebAPK from banner.

The "Open" button was calling SendBannerAccepted, which made the
assumption that the app was being installed. Removed this call and
documented the method's semantics.

BUG=716313

Review-Url: https://codereview.chromium.org/2848703005
Cr-Commit-Position: refs/heads/master@{#467903}
(cherry picked from commit d398f548f1929bf2a8307d02bc69065cd7cdc035)

Review-Url: https://codereview.chromium.org/2851223003 .
Cr-Commit-Position: refs/branch-heads/3071@{#339}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/68c2976343b37ebe1568ccc566fe...
==========

[Matt Giuca, 2017-05-02 04:06:59]

Committed patchset #1 (id:1) manually as
68c2976343b37ebe1568ccc566fe8c72ab74a795.