Introduce InterfaceEndpointClient(IEC), InterfaceEndpointHandle and

mojo/public/js/tests/connection_unittest.js

Index: mojo/public/js/tests/connection_unittest.js
diff --git a/mojo/public/js/tests/connection_unittest.js b/mojo/public/js/tests/connection_unittest.js
index feba87d789e65874b15fa79d2a0206a774da4901..857f0f4fe9b438dfe17c528f430e3195dfff56ba 100644
--- a/mojo/public/js/tests/connection_unittest.js
+++ b/mojo/public/js/tests/connection_unittest.js
@@ -115,20 +115,6 @@ define([
     var promise = provider.echoString("hello").then(function(response) {
       expect(response.a).toBe("hello");
       return provider.echoStrings("hello", "world");
-    }).then(function(response) {
-      expect(response.a).toBe("hello");
-      expect(response.b).toBe("world");
-      // Mock a read failure, expect it to fail.
-      core.readMessage = function() {
-        return { result: core.RESULT_UNKNOWN };
-      };
-      return provider.echoString("goodbye");
-    }).then(function() {
-      throw Error("Expected echoString to fail.");
-    }, function(error) {
-      expect(error.message).toBe("Connection error: " + core.RESULT_UNKNOWN);
-
-      return Promise.resolve();
     });
 
     return promise;