Remove no longer needed http proxy handling code, it's obsolete now

since we started to use java's HTTPConnection instead of the native
implementation. Also remove other remnants of the previous http implementation,
such as accounting for the http user's uid.

Change-Id: I60bfd31381ea40d2220db587ec5c433093b60034
diff --git a/media/libmediaplayerservice/nuplayer/GenericSource.cpp b/media/libmediaplayerservice/nuplayer/GenericSource.cpp
index 837e5b6..06aac33 100644
--- a/media/libmediaplayerservice/nuplayer/GenericSource.cpp
+++ b/media/libmediaplayerservice/nuplayer/GenericSource.cpp
@@ -35,9 +35,7 @@
         const sp<AMessage> &notify,
         const sp<IMediaHTTPService> &httpService,
         const char *url,
-        const KeyedVector<String8, String8> *headers,
-        bool uidValid,
-        uid_t uid)
+        const KeyedVector<String8, String8> *headers)
     : Source(notify),
       mDurationUs(0ll),
       mAudioIsVorbis(false) {