Revert "improve domain class detection"

This reverts commit 66e234c.

Author: jeffscottbrown

grails-core/src/main/groovy/org/grails/compiler/injection/GrailsASTUtils.java

@@ -726,11 +726,16 @@ public static boolean isDomainClass(final ClassNode classNode, final SourceUnit
 
         if (!isDomainClass && sourceNode != null) {
             final String sourcePath = sourceNode.getName();
-            final int indexOfGrailsAppDir = sourcePath.lastIndexOf("grails-app");
-            if(indexOfGrailsAppDir >= 0) {
-                final String relativePathToDomainSourceFile = classNode.getName().replaceAll("\\.", File.separator) + ".groovy";
-                final String pathToDomainSourceFile = sourcePath.substring(0, indexOfGrailsAppDir + 11) + DOMAIN_DIR + File.separator + relativePathToDomainSourceFile;
-                isDomainClass = new File(pathToDomainSourceFile).exists();
+            final File sourceFile = new File(sourcePath);
+            File parent = sourceFile.getParentFile();
+            while (parent != null && !isDomainClass) {
+                final File parentParent = parent.getParentFile();
+                if (parent.getName().equals(DOMAIN_DIR) &&
+                        parentParent != null &&
+                        parentParent.getName().equals(GRAILS_APP_DIR)) {
+                    isDomainClass = true;
+                }
+                parent = parentParent;
             }
         }