Adding webview tests to app_shell_browsertests.

Adding webview tests to app_shell_browsertests.

Tests added in this CL:
TestLoadAbortChromeExtensionURLWrongPartition
TestLoadAbortIllegalChromeURL
TestLoadAbortIllegalFileURL
TestLoadAbortIllegalJavaScriptURL
TestLoadAbortInvalidNavigation
TestLoadAbortNonWebSafeScheme
TestLoadProgressEvent

BUG=352293
Committed: https://crrev.com/e65fb36c46e761ffb1e8fd09008619d133995f61
Cr-Commit-Position: refs/heads/master@{#297298}

[lfg, 2014-09-29 20:56:19]

lfg@chromium.org changed reviewers:
+ lazyboy@chromium.org

[lazyboy, 2014-09-29 21:38:49]

lgtm

[lfg, 2014-09-29 21:42:11]

lfg@chromium.org changed reviewers:
+ yoz@chromium.org

[Yoyo Zhou, 2014-09-29 21:55:14]

also LGTM

[lfg, 2014-09-29 22:55:40]

The CQ bit was checked by lfg@chromium.org

[commit-bot: I haz the power, 2014-09-29 22:57:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/601553005/20001

[commit-bot: I haz the power, 2014-09-29 23:18:04]

Committed patchset #2 (id:20001) as e50c2fdda0dfce059fa09858a44552a2bd1fb934

[commit-bot: I haz the power, 2014-09-29 23:19:03]

Patchset 2 (id:??) landed as
https://crrev.com/e65fb36c46e761ffb1e8fd09008619d133995f61
Cr-Commit-Position: refs/heads/master@{#297298}