Remove write action around finishLookup(), according to IJ 2017.1 req

idea/idea-completion/tests/org/jetbrains/kotlin/idea/completion/test/handlers/CompletionHandlerTestBase.kt

@@ -22,8 +22,6 @@ import com.intellij.codeInsight.lookup.LookupElementPresentation
 import com.intellij.codeInsight.lookup.LookupEvent
 import com.intellij.codeInsight.lookup.LookupManager
 import com.intellij.codeInsight.lookup.impl.LookupImpl
-import com.intellij.openapi.application.Result
-import com.intellij.openapi.command.WriteCommandAction
 import com.intellij.testFramework.fixtures.JavaCodeInsightTestFixture
 import org.jetbrains.kotlin.idea.completion.test.ExpectedCompletionUtils
 import org.jetbrains.kotlin.idea.test.KotlinLightCodeInsightFixtureTestCase
@@ -117,14 +115,7 @@ abstract class CompletionHandlerTestBase() : KotlinLightCodeInsightFixtureTestCa
         }
         lookup.focusDegree = LookupImpl.FocusDegree.FOCUSED
         if (LookupEvent.isSpecialCompletionChar(completionChar)) {
-            (object : WriteCommandAction.Simple<Any>(project) {
-                override fun run(result: Result<Any>) {
-                    run()
-                }
-                override fun run() {
-                    lookup.finishLookup(completionChar)
-                }
-            }).execute().throwException()
+            lookup.finishLookup(completionChar)
         }
         else {
             fixture.type(completionChar)