[DevTools] Scope common protocol infrastructure under Protocol namespace in a separate module.

third_party/WebKit/Source/devtools/front_end/main/Main.js

Index: third_party/WebKit/Source/devtools/front_end/main/Main.js
diff --git a/third_party/WebKit/Source/devtools/front_end/main/Main.js b/third_party/WebKit/Source/devtools/front_end/main/Main.js
index 198a93a8e4ef0dea29f75d900e276e611f449bae..4550d03085188599497d43f073003e30b16a6a3c 100644
--- a/third_party/WebKit/Source/devtools/front_end/main/Main.js
+++ b/third_party/WebKit/Source/devtools/front_end/main/Main.js
@@ -300,7 +300,7 @@ WebInspector.Main.prototype = {
 
     /**
      * @param {function(string)} onMessage
-     * @return {!Promise<!InspectorBackendClass.Connection>}
+     * @return {!Promise<!Protocol.Connection>}
      */
     _interceptMainConnection: function(onMessage)
     {
@@ -312,8 +312,8 @@ WebInspector.Main.prototype = {
     },
 
     /**
-     * @param {!InspectorBackendClass.Connection.Params} params
-     * @return {!InspectorBackendClass.Connection}
+     * @param {!Protocol.Connection.Params} params
+     * @return {!Protocol.Connection}
      */
     _createMainConnection: function(params)
     {
@@ -959,7 +959,7 @@ WebInspector.Main.InspectedNodeRevealer.prototype = {
 WebInspector.sendOverProtocol = function(method, params)
 {
     return new Promise((resolve, reject) => {
-        InspectorBackendClass.sendRawMessageForTesting(method, params, (err, result) => {
+        Protocol.sendRawMessageForTesting(method, params, (err, result) => {
             if (err)
                 return reject(err);
             return resolve(result);