Fix: ScriptProfiler::visitNodeWrappers shouldn't try to check for wrappers in a specific world.

The code iterates through all persistent handles of a particular class - not
restricted by isolate or world - and then asserts there are wrappers for them in
a particular world. This is wrong.

In addition, this function can be called without a context, and trying to get a
worldType from an isolate fails in that case.

The original ASSERT was added in https://bugs.webkit.org/show_bug.cgi?id=111724
 and it was an error to use HasInstance and not HasInstanceInAnyWorld here.

BUG=

Review URL: https://chromiumcodereview.appspot.com/19154005

git-svn-id: svn://svn.chromium.org/blink/trunk@154217 bbb929c8-8fbe-4397-9dbb-9b2b20218538