AppRTCDemo(android): README updates for a shrinking envsetup.sh world.

There was duplicated (and out of date!) information in README relative to
getting-started so de-duped to point to getting-started as the canonical
reference.

R=wu@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/15589006

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6265 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/talk/examples/android/README b/talk/examples/android/README
index 4e3db86..faf4e92 100644
--- a/talk/examples/android/README
+++ b/talk/examples/android/README
@@ -1,19 +1,9 @@
 This directory contains an example Android client for http://apprtc.appspot.com 
 
 Prerequisites:
-- Make sure gclient is checking out tools necessary to target Android: your
-  .gclient file should contain a line like:
-  target_os = ['android', 'unix']
-  Make sure to re-run gclient sync after adding this to download the tools.
-- Env vars need to be set up to target Android; easiest way to do this is to run
-  (from the libjingle trunk directory):
-  . ./build/android/envsetup.sh
-  Note that this clobbers any previously-set $GYP_DEFINES so it must be done
-  before the next item.
+- "Android Specific Steps" on http://www.webrtc.org/reference/getting-started
 - Set up webrtc-related GYP variables:
   export GYP_DEFINES="build_with_libjingle=1 build_with_chromium=0 libjingle_java=1 $GYP_DEFINES"
-  export JAVA_HOME=</path/to/JDK>
-  export PATH=$JAVA_HOME/bin:$PATH
   To cause WEBRTC_LOGGING to emit to Android's logcat, add enable_tracing=1 to
   the $GYP_DEFINES above.
 - When targeting both desktop & android, make sure to use a different output_dir