Convert analysis server over to use ContextBuilder

pkg/analysis_server/test/completion_test.dart

Index: pkg/analysis_server/test/completion_test.dart
diff --git a/pkg/analysis_server/test/completion_test.dart b/pkg/analysis_server/test/completion_test.dart
index 2a453eb949492472ca7825e0fe4594864d04f26a..de88533b2720b0cb234a4b6e266436e826bd9fde 100644
--- a/pkg/analysis_server/test/completion_test.dart
+++ b/pkg/analysis_server/test/completion_test.dart
@@ -2664,7 +2664,7 @@ class Q {
           "8-null"
         ],
         failingTests: '234567'); //TODO(jwren) 234 failing as correct selection
-        // offset assertions can't be passed into buildTests(..)
+    // offset assertions can't be passed into buildTests(..)
 
     // keywords
     buildTests('test018', '''!1part !2of foo;''', <String>["1+part", "2+of"],
@@ -2905,8 +2905,8 @@ class A<Z extends X> {
         failingTests: '2');
 
     // test analysis of untyped fields and top-level vars
-    buildTests('test039', '''class X{}var x = null as !1X;''',
-        <String>["1-void"]);
+    buildTests(
+        'test039', '''class X{}var x = null as !1X;''', <String>["1-void"]);
 
     // test arg lists with named params
     buildTests('test040', '''m(){f(a, b, {x1, x2, y}) {};f(1, 2, !1)!2;}''',