AppRTCDemo: builds using ninja on iOS for simulator and device!

Things included in this CL:
- updated READMEs to provide an exact/reproable set of steps for getting the app
  running.
- gyp changes to build the iOS AppRTCDemo sample app using gyp+ninja instead of
  the hand-crafted Xcode project (which has never worked in its checked-in
  form), including a gyp action to sign the sample app for deployment to an iOS
  device (the app can also be used in the simulator)
- deleted the busted hand-crafted Xcode project for the sample app
- updated the sample app to match the PeerConnection API that ended up landing
  (in a surprising twist of fate, the API landed quite a bit later than the
  sample app and this is the first time the CR-time changes in the API are
  reflected in the sample app)
- updated the sample app to reflect apprtc.appspot.com HTML/JS changes (equiv to
  the AppRTCClient.java changes in http://s10/47299162)
- picked up the iossim DEPS to enable launching the sample app in the simulator
  from the command-line.
- renamed some files to match capitalization of the classes they contain (Ice ->
  ICE) per ObjC naming guidelines.
- ran the files involved in this CL through clang-format to deal with xcode
  formatting craxy.

BUG=2106
RISK=P2
TESTED=unittest builds with ninja and passes on OS=mac; sample app builds with ninja and runs on simulator and device, though no audio flows from simulator/device (will fix in a follow-up CL)
R=andrew@webrtc.org, justincohen@google.com, wu@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1874005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@4466 4adac7df-926f-26a2-2b94-8c16560cd09d

DEPS

@@ -131,12 +131,29 @@ deps_os = {
     # NSS, for SSLClientSocketNSS.
     "third_party/nss":
       From("chromium_deps", "src/third_party/nss"),
+
+    # TODO(fischman): delete this in favor of the copy in "ios" below, once the
+    # webrtc iOS bots are fixed to target_os=['ios'] in their .gclient
+    # https://code.google.com/p/webrtc/issues/detail?id=2152
+    "net/third_party/nss":
+      Var("chromium_trunk") + "/src/net/third_party/nss@" + Var("chromium_revision"),
   },
 
   "ios": {
     # NSS, for SSLClientSocketNSS.
     "third_party/nss":
       From("chromium_deps", "src/third_party/nss"),
+
+    "net/third_party/nss":
+      Var("chromium_trunk") + "/src/net/third_party/nss@" + Var("chromium_revision"),
+
+    # class-dump utility to generate header files for undocumented SDKs.
+    "testing/iossim/third_party/class-dump":
+      From("chromium_deps", "src/testing/iossim/third_party/class-dump"),
+
+    # Helper for running under the simulator.
+    "testing/iossim":
+      Var("chromium_trunk") + "/src/testing/iossim@" + Var("chromium_revision"),
   },
 
   "unix": {