Undo: expose webrtc version for android (#21)

Author: kanat

sdk/android/BUILD.gn

@@ -156,8 +156,6 @@ if (is_android) {
  sources = [
  "api/org/webrtc/Predicate.java",
  "api/org/webrtc/RefCounted.java",
- "api/org/webrtc/WebrtcBuildVersion.java",
- "src/java/org/webrtc/ApplicationContextProvider.java",
  "src/java/org/webrtc/CalledByNative.java",
  "src/java/org/webrtc/CalledByNativeUnchecked.java",
  "src/java/org/webrtc/Histogram.java",