Annotation whitespace convention fixes (dartbug.com/17837).

pkg/analyzer/test/services/data/cu_tests.data

 >>>
 class
 A
 {
 }
 <<<
 class A {
 }
 >>> dartbug.com/15876
 // fisk
@@ skipping 228 matching lines @@
 class Foo extends Bar {
   final int b;
   Foo(int a, int b) : super(a), this.b = b == null ? 0 : b;
 }
 <<<
 class Foo extends Bar {
   final int b;
   Foo(int a, int b)
       : super(a),
         this.b = b == null ? 0 : b;
+}
+>>> dartbug.com/17837
+@meta class Foo {
+  @meta String foo;
+  @meta int bar() => 42;
+}
+@meta
+class Bar {
+  @meta
+  String foo;
+  @meta
+  int bar() => 42;
+}
+<<<
+@meta class Foo {
+  @meta String foo;
+  @meta int bar() => 42;
+}
+@meta
+class Bar {
+  @meta
+  String foo;
+  @meta
+  int bar() => 42;
 }