Remove references to build_with_libjingle and libjingle_java GYP variables.

These were removed a while back in https://codereview.webrtc.org/1457053003

TBR=tkchin@webrtc.org

Review URL: https://codereview.webrtc.org/1790753004 .

Cr-Commit-Position: refs/heads/master@{#11967}

talk/app/webrtc/objc/README

@@ -11,9 +11,7 @@ Prerequisites:
 - Set up webrtc-related $GYP_DEFINES; example shell functions that set
   up for building for iOS-device, iOS-simulator, and Mac (resp) are:
 function wrbase() {
-  cd /path/to/webrtc/trunk
-  export GYP_DEFINES="build_with_libjingle=1 build_with_chromium=0"
-  export GYP_GENERATORS="ninja"
+  cd /path/to/webrtc/src
 }
 
 function wrios() {

webrtc/build/webrtc.gni

@@ -12,8 +12,6 @@ import("//build/config/mips.gni")
 import("//build_overrides/webrtc.gni")
 
 declare_args() {
-  build_with_libjingle = true
-
   # Disable this to avoid building the Opus audio codec.
   rtc_include_opus = true
 
@@ -58,13 +56,8 @@ declare_args() {
   # https://gcc.gnu.org/wiki/LinkTimeOptimization
   rtc_use_lto = false
 
-  if (build_with_libjingle) {
-    rtc_include_tests = false
-    rtc_restrict_logging = true
-  } else {
-    rtc_include_tests = true
-    rtc_restrict_logging = false
-  }
+  rtc_include_tests = false
+  rtc_restrict_logging = true
 
   if (is_ios) {
     rtc_build_libjpeg = false

webrtc/examples/androidapp/README

@@ -3,10 +3,7 @@ This directory contains an example Android client for https://apprtc.appspot.com
 Prerequisites:
 - "Getting the code" on http://www.webrtc.org/native-code/android
 - Set up webrtc-related GYP variables:
-  export GYP_DEFINES="build_with_libjingle=1 build_with_chromium=0 libjingle_java=1
-  OS=android $GYP_DEFINES"
-  To cause WEBRTC_LOGGING to emit to Android's logcat, add enable_tracing=1 to
-  the $GYP_DEFINES above.
+  export GYP_DEFINES="OS=android $GYP_DEFINES"
 - When targeting both desktop & android, make sure to use a different output_dir
   value in $GYP_GENERATOR_FLAGS - for example
   export GYP_GENERATOR_FLAGS="$GYP_GENERATOR_FLAGS output_dir=out_android"