revert gradle change

packages/google_sign_in/google_sign_in/android/build.gradle

@@ -32,33 +32,3 @@ android {
         disable 'InvalidPackage'
     }
 }
-
-dependencies {
-    implementation 'com.google.android.gms:play-services-auth:16.0.1'
-    implementation 'com.google.guava:guava:20.0'
-}
-
-afterEvaluate {
-    def containsEmbeddingDependencies = false
-    for (def configuration : configurations.all) {
-        for (def dependency : configuration.dependencies) {
-            if (dependency.group == 'io.flutter' &&
-                dependency.name.startsWith('flutter_embedding') &&
-                dependency.isTransitive())
-            {
-                containsEmbeddingDependencies = true
-                break
-            }
-        }
-    }
-    if (!containsEmbeddingDependencies) {
-        android {
-            dependencies {
-                def lifecycle_version = "1.1.1"
-                compileOnly "android.arch.lifecycle:runtime:$lifecycle_version"
-                compileOnly "android.arch.lifecycle:common:$lifecycle_version"
-                compileOnly "android.arch.lifecycle:common-java8:$lifecycle_version"
-            }
-        }
-    }
-}