Convert intellij usages in the groovy build scripts

libraries/examples/kotlin-gradle-subplugin-example/build.gradle

@@ -1,8 +1,4 @@
 
-plugins {
-    id 'org.jetbrains.intellij'
-}
-
 apply plugin: 'kotlin'
 apply plugin: 'maven'
 
@@ -11,13 +7,6 @@ repositories {
     jcenter()
 }
 
-intellij {
-    version = rootProject.ext["versions.intellij"]
-    instrumentCode = false
-    configureDefaultDependencies = false
-    extraDependencies = ['intellij-core']
-}
-
 dependencies {
     compile project(':kotlin-gradle-plugin-api')
     // Use this dependency instead when building apart from the other modules:
@@ -34,8 +23,10 @@ dependencies {
     compileOnly gradleApi()
 }
 
-afterEvaluate {
-    dependencies {
-        compileOnly intellijExtra('intellij-core')
+    compileOnly("kotlin.build.custom.deps:intellij-core:${rootProject.ext["versions.intellijSdk"]}") {
+        artifact {
+            name = 'intellij-core'
+            extension = 'jar'
+        }
     }
-}
+}