Apply code review comments

Co-authored-by: Anders Schack-Mulligen <aschackmull@users.noreply.github.com>

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

@@ -12,7 +12,7 @@ private class CookieCleartextStorageSink extends CleartextStorageSink {
 /** The instantiation of a cookie, which can act as storage. */
 class Cookie extends Storable, ClassInstanceExpr {
   Cookie() {
-    this.getConstructor().getDeclaringType().getQualifiedName() = "javax.servlet.http.Cookie"
+    this.getConstructor().getDeclaringType().hasQualifiedName("javax.servlet.http", "Cookie")
   }
 
   /** Gets an input, for example `input` in `new Cookie("...", input);`. */
@@ -31,7 +31,7 @@ private predicate cookieStore(DataFlow::Node cookie, Expr store) {
   exists(MethodAccess m, Method def |
     m.getMethod() = def and
     def.getName() = "addCookie" and
-    def.getDeclaringType().getQualifiedName() = "javax.servlet.http.HttpServletResponse" and
+    def.getDeclaringType().hasQualifiedName("javax.servlet.http", "HttpServletResponse") and
     store = m and
     cookie.asExpr() = m.getAnArgument()
   )

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

@@ -17,13 +17,7 @@ class CleartextStorageAdditionalTaintStep extends Unit {
 }
 
 /** Class for expressions that may represent 'sensitive' information */
-class SensitiveSource extends Expr {
-  SensitiveSource() {
-    // SensitiveExpr is abstract, this lets us inherit from it without
-    // being a technical subclass
-    this instanceof SensitiveExpr
-  }
-
+class SensitiveSource extends Expr instanceof SensitiveExpr {
   /** Holds if this source flows to the `sink`. */
   predicate flowsTo(Expr sink) {
     exists(SensitiveSourceFlowConfig conf |