Ensure ShellExtensionSystem::Init() is called in all extensions_browsertests.

Ensure ShellExtensionSystem::Init() is called in all extensions_browsertests.

This manifested in hangs in a test with PlzNavigate after r429936 now that NavigationUIData was being set. This correctly led to the WebRequest API code (ExtensionWebRequestEventRouter::ProcessDeclarativeRules) classifying a request as a webview one, and waiting for rules_registry->ready() to signal. That's signalled through ShellExtensionSystem::Init.

This fixes
WebViewAPITest.TestNewWindow
with PlzNavigate.

BUG=661812
Committed: https://crrev.com/d2a5e683bf6562bd0eb86c2c8281a025a1aee5f0
Cr-Commit-Position: refs/heads/master@{#430075}

[jam, 2016-11-04 23:22:03]

The CQ bit was checked by jam@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-11-04 23:22:56]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[jam, 2016-11-04 23:23:39]

jam@chromium.org changed reviewers:
+ rockot@chromium.org

[Ken Rockot(use gerrit already), 2016-11-04 23:26:04]

lgtm

[jam, 2016-11-04 23:26:37]

The CQ bit was unchecked by jam@chromium.org

[jam, 2016-11-04 23:27:14]

The CQ bit was checked by jam@chromium.org

[jam, 2016-11-04 23:27:17]

The CQ bit was checked by jam@chromium.org

[commit-bot: I haz the power, 2016-11-04 23:28:04]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-11-05 00:16:40]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-05 00:19:51]

Description was changed from

==========
Ensure ShellExtensionSystem::Init() is called in all extensions_browsertests.

This manifested in hangs in a test with PlzNavigate after r429936 now that
NavigationUIData was being set. This correctly led to the WebRequest API code
(ExtensionWebRequestEventRouter::ProcessDeclarativeRules) classifying a request
as a webview one, and waiting for rules_registry->ready() to signal. That's
signalled through ShellExtensionSystem::Init.

This fixes
WebViewAPITest.TestNewWindow
with PlzNavigate.

BUG=661812
==========

to

==========
Ensure ShellExtensionSystem::Init() is called in all extensions_browsertests.

This manifested in hangs in a test with PlzNavigate after r429936 now that
NavigationUIData was being set. This correctly led to the WebRequest API code
(ExtensionWebRequestEventRouter::ProcessDeclarativeRules) classifying a request
as a webview one, and waiting for rules_registry->ready() to signal. That's
signalled through ShellExtensionSystem::Init.

This fixes
WebViewAPITest.TestNewWindow
with PlzNavigate.

BUG=661812

Committed: https://crrev.com/d2a5e683bf6562bd0eb86c2c8281a025a1aee5f0
Cr-Commit-Position: refs/heads/master@{#430075}
==========

[commit-bot: I haz the power, 2016-11-05 00:19:52]

Patchset 1 (id:??) landed as
https://crrev.com/d2a5e683bf6562bd0eb86c2c8281a025a1aee5f0
Cr-Commit-Position: refs/heads/master@{#430075}