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

third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js

Index: third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js b/third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js
index 85e2e4aee06d1567bbf6b9d87ca9411d067d8812..5cd6679d8732feb7d679e54c19be68e3c9b54b4a 100644
--- a/third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js
+++ b/third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js
@@ -183,7 +183,7 @@ WebInspector.TargetManager.prototype = {
     /**
      * @param {string} name
      * @param {number} capabilitiesMask
-     * @param {!InspectorBackendClass.Connection.Factory} connectionFactory
+     * @param {!Protocol.Connection.Factory} connectionFactory
      * @param {?WebInspector.Target} parentTarget
      * @return {!WebInspector.Target}
      */
@@ -236,7 +236,7 @@ WebInspector.TargetManager.prototype = {
     },
 
     /**
-     * @param {function(function(string)):!Promise<!InspectorBackendClass.Connection>} interceptor
+     * @param {function(function(string)):!Promise<!Protocol.Connection>} interceptor
      */
     setMainConnectionInterceptor: function(interceptor)
     {
@@ -245,7 +245,7 @@ WebInspector.TargetManager.prototype = {
 
     /**
      * @param {function(string)} onMessage
-     * @return {!Promise<!InspectorBackendClass.Connection>}
+     * @return {!Promise<!Protocol.Connection>}
      */
     interceptMainConnection: function(onMessage)
     {