Android Mainline 11.0.0 Release 31 (7313725)
Fix ReferencesHidden issues in apache http

We had RequestQueue had several public APIs that used
hidden Connection and Request classes. This made these
impossible to call for developers and in fact stubs would
not even compile without a metalava workaround for this.

This CL remove the disabling of ReferencesHidden as ignoring
ReferencesHidden leads to pulling in hidden classes
into API surfaces which is always a bug. Removing hiding here
so this option to suppress can be removed completely.

Bug: 146727827
Exempt-From-Owner-Approval: Cherry-picking from master
Test: make -j -> passes
Change-Id: I8e02af533be5cd0eccad0d9eed0a85c9b1b9b3e8
Merged-in: I8e02af533be5cd0eccad0d9eed0a85c9b1b9b3e8
4 files changed