Don't test for AppCache callbacks.

Remove the code in WebSettingsTest#testAppCacheEnabled which asserts
that AppCachee callbacks actually happen; the implementation of AppCache
in Chromium is going to be removed in future so it won't be possible for
this test to pass beyond that point.

Bug: 156266477
Test: atest WebSettingsTest#testAppCacheEnabled
Merged-In: Iff215f060387eb5cfd798caa56dcd02ea1e9d7af
Change-Id: Iff215f060387eb5cfd798caa56dcd02ea1e9d7af
1 file changed