Don't update progress when Frame::isLoading() is false

Don't update progress when Frame::isLoading() is false

This can lead to spurious progress change notifications, which can lead to underestimatation of progress, even at the time when the only page is complete.

This was regressed in https://codereview.chromium.org/1860743002

BUG=650781
Review-Url: https://codereview.chromium.org/2412803004
Cr-Commit-Position: refs/heads/master@{#425178}
(cherry picked from commit aa70a46d3bfff89100ab5732812dbb7a8dac7953)

Committed: https://chromium.googlesource.com/chromium/src/+/931e8cb4d9bcc1a1864e8d513487b3eb36d2ecf8

[Nate Chapin, 2016-10-14 22:42:55]

Description was changed from

==========
Don't update progress when Frame::isLoading() is false

This can lead to spurious progress change notifications, which can lead to
underestimatation of progress, even at the time when the only page is complete.

This was regressed in https://codereview.chromium.org/1860743002

BUG=650781

Review-Url: https://codereview.chromium.org/2412803004
Cr-Commit-Position: refs/heads/master@{#425178}
(cherry picked from commit aa70a46d3bfff89100ab5732812dbb7a8dac7953)
==========

to

==========
Don't update progress when Frame::isLoading() is false

This can lead to spurious progress change notifications, which can lead to
underestimatation of progress, even at the time when the only page is complete.

This was regressed in https://codereview.chromium.org/1860743002

BUG=650781

Review-Url: https://codereview.chromium.org/2412803004
Cr-Commit-Position: refs/heads/master@{#425178}
(cherry picked from commit aa70a46d3bfff89100ab5732812dbb7a8dac7953)

Committed:
https://chromium.googlesource.com/chromium/src/+/931e8cb4d9bcc1a1864e8d513487...
==========

[Nate Chapin, 2016-10-14 22:42:57]

Committed patchset #1 (id:1) manually as
931e8cb4d9bcc1a1864e8d513487b3eb36d2ecf8.