Fix imports

Author: atorralba

java/ql/lib/semmle/code/java/security/ImplicitPendingIntents.qll

@@ -1,8 +1,6 @@
 /** Provides classes and predicates for working with implicit `PendingIntent`s. */
 
 import java
-private import semmle.code.java.dataflow.ExternalFlow
-private import semmle.code.java.dataflow.FlowSteps
 private import semmle.code.java.dataflow.TaintTracking
 private import semmle.code.java.frameworks.android.Intent
 private import semmle.code.java.frameworks.android.PendingIntent

java/ql/lib/semmle/code/java/security/ImplicitPendingIntentsQuery.qll

@@ -1,9 +1,9 @@
 /** Provides taint tracking configurations to be used in queries related to implicit `PendingIntent`s. */
 
 import java
-import semmle.code.java.dataflow.ExternalFlow
 import semmle.code.java.dataflow.TaintTracking
 import semmle.code.java.frameworks.android.Intent
+import semmle.code.java.frameworks.android.PendingIntent
 import semmle.code.java.security.ImplicitPendingIntents
 
 /**