[inspector] Refactor protocol-test.js

test/inspector/debugger/set-breakpoint-before-enabling.js

Index: test/inspector/debugger/set-breakpoint-before-enabling.js
diff --git a/test/inspector/debugger/set-breakpoint-before-enabling.js b/test/inspector/debugger/set-breakpoint-before-enabling.js
index 8480aa6f75d6691672222dfaa1783c9e543bd60d..84541be37deb03ceaedcac3a0c249943d326d138 100644
--- a/test/inspector/debugger/set-breakpoint-before-enabling.js
+++ b/test/inspector/debugger/set-breakpoint-before-enabling.js
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+let {session, contextGroup, Protocol} = InspectorTest.start('Tests that setting breakpoint before enabling debugger produces an error');
+
 Protocol.Debugger.setBreakpointByUrl({ url: "http://example.com", lineNumber: 10  }).then(didSetBreakpointByUrlBeforeEnable);
 
 function didSetBreakpointByUrlBeforeEnable(message)