Replace and remove JavaException(s).

pkg/analysis_server/test/completion_test_support.dart

Index: pkg/analysis_server/test/completion_test_support.dart
diff --git a/pkg/analysis_server/test/completion_test_support.dart b/pkg/analysis_server/test/completion_test_support.dart
index c2fb7a1e2836f5939efd12293f00fe6fedb8cd71..1ef8e4c9e9e227e6250a2ff57211550ae7ed9b44 100644
--- a/pkg/analysis_server/test/completion_test_support.dart
+++ b/pkg/analysis_server/test/completion_test_support.dart
@@ -151,18 +151,18 @@ class LocationSpec {
           modifiedSource.substring(index + n);
     }
     if (modifiedSource == originalSource) {
-      throw new IllegalStateException("No tests in source: " + originalSource);
+      throw new StateError("No tests in source: " + originalSource);
     }
     for (String result in validationStrings) {
       if (result.length < 3) {
-        throw new IllegalStateException("Invalid location result: " + result);
+        throw new StateError("Invalid location result: " + result);
       }
       String id = result.substring(0, 1);
       String sign = result.substring(1, 2);
       String value = result.substring(2);
       LocationSpec test = tests[id];
       if (test == null) {
-        throw new IllegalStateException(
+        throw new StateError(
             "Invalid location result id: $id for: $result");
       }
       test.source = modifiedSource;
@@ -172,7 +172,7 @@ class LocationSpec {
         test.negativeResults.add(value);
       } else {
         String err = "Invalid location result sign: $sign for: $result";
-        throw new IllegalStateException(err);
+        throw new StateError(err);
       }
     }
     List<String> badPoints = <String>[];
@@ -200,7 +200,7 @@ class LocationSpec {
           err..write(' ')..write(ch);
         }
       }
-      throw new IllegalStateException(err.toString());
+      throw new StateError(err.toString());
     }
     return tests.values.toList();
   }