Split out tests of private scripts from Internals to PrivateScriptTest

Split out tests of private scripts from Internals to PrivateScriptTest

This is a clean-up CL of Blink-in-JS.
Instead of adding more tests about private scripts to Internals,
we should have a dedicated IDL file to handle those tests.

BUG=341031
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=177629

[haraken, 2014-07-07 11:14:17]

PTAL

[abarth-chromium, 2014-07-07 16:03:48]

LGTM

https://codereview.chromium.org/376553004/diff/20001/Source/core/testing/Priv...
File Source/core/testing/PrivateScriptTest.h (right):

https://codereview.chromium.org/376553004/diff/20001/Source/core/testing/Priv...
Source/core/testing/PrivateScriptTest.h:13: class PrivateScriptTest : public
RefCountedWillBeGarbageCollected<PrivateScriptTest> {
Why not just GarbageCollected?

[haraken, 2014-07-08 01:26:50]

The CQ bit was checked by haraken@chromium.org

[commit-bot: I haz the power, 2014-07-08 01:27:43]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/haraken@chromium.org/376553004/40001

[commit-bot: I haz the power, 2014-07-08 02:32:27]

Change committed as 177629