Remove WebRTC's nssidentity.{cc,h} and nssstreamadapter.{cc,h} from libjingle NaCl gyp file.
Remove WebRTC's nssidentity.{cc,h} and nssstreamadapter.{cc,h} from libjingle NaCl gyp file.

BUG=webrtc:4497

Review URL: https://codereview.chromium.org/1358913003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#350146}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk