Fix WebStorageSizeManagerUnitTest NPE

Previously we passed a null Context into the WebStorageSizeManager
from the unit test. After the refactoring to get the
application context from the passed in Context, this no longer
works. So pass in a valid Context.

(See Ib0be5f8c for the regression)

Bug: 5319628
Change-Id: I691e2edb0a4174076c7599525569d104a83d3442
2 files changed