Avoid using jetbrains.annotations.

Change-Id: Id2305d6d0e82d5982417f109a57da62f4e32f11e
diff --git a/src/main/java/com/android/tools/r8/cf/CfPrinter.java b/src/main/java/com/android/tools/r8/cf/CfPrinter.java
index 8e5de6a..6f0911f 100644
--- a/src/main/java/com/android/tools/r8/cf/CfPrinter.java
+++ b/src/main/java/com/android/tools/r8/cf/CfPrinter.java
@@ -73,7 +73,6 @@
 import java.util.ListIterator;
 import java.util.Set;
 import java.util.stream.Collectors;
-import org.jetbrains.annotations.NotNull;
 import org.objectweb.asm.Opcodes;
 import org.objectweb.asm.Type;
 import org.objectweb.asm.util.Printer;
@@ -210,7 +209,6 @@
     return localsAtLabel;
   }
 
-  @NotNull
   private List<LocalVariableInfo> getSortedLocalVariables(CfCode code) {
     List<LocalVariableInfo> localVariables = new ArrayList<>(code.getLocalVariables());
     localVariables.sort(