Remove service-compiler related code.

samples/github/android/GithubMock/app/proguard-rules.pro

Index: samples/github/android/GithubMock/app/proguard-rules.pro
diff --git a/samples/github/android/GithubMock/app/proguard-rules.pro b/samples/github/android/GithubMock/app/proguard-rules.pro
deleted file mode 100644
index c550f04d00f955a2e24931878693a2097067453c..0000000000000000000000000000000000000000
--- a/samples/github/android/GithubMock/app/proguard-rules.pro
+++ /dev/null
@@ -1,17 +0,0 @@
-# Add project specific ProGuard rules here.
-# By default, the flags in this file are appended to flags specified
-# in <android-sdk>/tools/proguard/proguard-android.txt
-# You can edit the include path and order by changing the proguardFiles
-# directive in build.gradle.
-#
-# For more details, see
-#   http://developer.android.com/guide/developing/tools/proguard.html
-
-# Add any project specific keep options here:
-
-# If your project uses WebView with JS, uncomment the following
-# and specify the fully qualified class name to the JavaScript interface
-# class:
-#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
-#   public *;
-#}