Reland of Clear the login webview when SAML flow is canceled (original CL crrev.com/1988113004).

Reland of Clear the login webview when SAML flow is canceled (original CL crrev.com/1988113004).

The original CL was later reverted (CL crrev.com/2068953003) due to
frequent failures of the SAMLPolicyTest.SAMLInterstitialNext test.

This follow-up CL should resolve the tests flakiness.

The problem with the original CL was that it could introduce raising the
"ready" event too early, so that the test code could start working when
the webview was still pointing to the blank page.

BUG=613245, 620353
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2082533002
Cr-Commit-Position: refs/heads/master@{#400703}
(cherry picked from commit 93dc10b6eaaf3be6c4634a2e91e671da21338424)

Committed: https://chromium.googlesource.com/chromium/src/+/4aa965d679259cc8545572fd4a34688671920711

[emaxx, 2016-07-08 01:18:40]

Description was changed from

==========
Reland of Clear the login webview when SAML flow is canceled (original CL
crrev.com/1988113004).

The original CL was later reverted (CL crrev.com/2068953003) due to
frequent failures of the SAMLPolicyTest.SAMLInterstitialNext test.

This follow-up CL should resolve the tests flakiness.

The problem with the original CL was that it could introduce raising the
"ready" event too early, so that the test code could start working when
the webview was still pointing to the blank page.

BUG=613245,620353
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2082533002
Cr-Commit-Position: refs/heads/master@{#400703}
(cherry picked from commit 93dc10b6eaaf3be6c4634a2e91e671da21338424)
==========

to

==========
Reland of Clear the login webview when SAML flow is canceled (original CL
crrev.com/1988113004).

The original CL was later reverted (CL crrev.com/2068953003) due to
frequent failures of the SAMLPolicyTest.SAMLInterstitialNext test.

This follow-up CL should resolve the tests flakiness.

The problem with the original CL was that it could introduce raising the
"ready" event too early, so that the test code could start working when
the webview was still pointing to the blank page.

BUG=613245,620353
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2082533002
Cr-Commit-Position: refs/heads/master@{#400703}
(cherry picked from commit 93dc10b6eaaf3be6c4634a2e91e671da21338424)

Committed:
https://chromium.googlesource.com/chromium/src/+/4aa965d679259cc8545572fd4a34...
==========

[emaxx, 2016-07-08 01:18:42]

Committed patchset #1 (id:1) manually as
4aa965d679259cc8545572fd4a34688671920711.