Rewrite BrowserTest.PageLanguageDetection to use a new tab instead of the one with about:blank.

Rewrite BrowserTest.PageLanguageDetection to use a new tab instead of the one with about:blank.

Revert "Revert 88068 (Mac 10.5 bots are failing) - No longer require nonzero content to send it to the translate helper. In practice this makes an empty page's language be detected as "und" instead of failing to be detected."

This reverts commit 3ca079900c491836610c9452f9894bb5bdebdeac.

Conflicts:

	chrome/test/data/extensions/api_test/tabs/basics/crud.html

BUG=60802
TEST=ExtensionApiTest.Tabs detectLanguage, and BrowserTest.PageLanguageDetection


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=88567

[Jay Civelli, 2011-06-09 16:02:43]

LGTM

[commit-bot: I haz the power, 2011-06-09 16:41:14]

Try job failure for 7044071-1 on win for step compile:
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win&number...

[commit-bot: I haz the power, 2011-06-09 17:15:07]

Try job failure for 7044071-1 on mac for step media_unittests:
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=mac&number...

[commit-bot: I haz the power, 2011-06-09 18:01:32]

Try job failure for 7044071-1 on linux for step update_scripts:
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux&numb...

[commit-bot: I haz the power, 2011-06-09 19:18:55]

Change committed as 88567