Remove unused import from AssumeNoSideEffectsRuleForObjectMembersDiagnostic

Change-Id: Iaa78638117744f85b04a16fb35714f6eb98215f6
diff --git a/src/main/java/com/android/tools/r8/errors/AssumeNoSideEffectsRuleForObjectMembersDiagnostic.java b/src/main/java/com/android/tools/r8/errors/AssumeNoSideEffectsRuleForObjectMembersDiagnostic.java
index 8910cda..cb4fafb 100644
--- a/src/main/java/com/android/tools/r8/errors/AssumeNoSideEffectsRuleForObjectMembersDiagnostic.java
+++ b/src/main/java/com/android/tools/r8/errors/AssumeNoSideEffectsRuleForObjectMembersDiagnostic.java
@@ -5,7 +5,6 @@
 
 import com.android.tools.r8.Diagnostic;
 import com.android.tools.r8.Keep;
-import com.android.tools.r8.errors.CheckDiscardDiagnostic.Builder;
 import com.android.tools.r8.graph.DexMethod;
 import com.android.tools.r8.origin.Origin;
 import com.android.tools.r8.position.Position;