Mojo C++ bindings: Add an alias, BarAssociatedPtr, for AssociatedInterfacePtr<Bar>.

mojo/public/cpp/bindings/tests/associated_interface_unittest.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/threading/thread.h"
@@ skipping 459 matching lines @@
   for (size_t i = 0; i < 2; ++i) {
     for (size_t j = 1; j < receivers[i].values().size(); ++j)
       EXPECT_LT(receivers[i].values()[j - 1], receivers[i].values()[j]);
   }
 }
 
 TEST_F(AssociatedInterfaceTest, PassAssociatedInterfaces) {
   IntegerSenderConnectionPtr connection_ptr;
   IntegerSenderConnectionImpl connection(GetProxy(&connection_ptr));
 
-  AssociatedInterfacePtr<IntegerSender> sender0;
+  IntegerSenderAssociatedPtr sender0;
   connection_ptr->GetSender(
       GetProxy(&sender0, connection_ptr.associated_group()));
 
   int32_t echoed_value = 0;
   sender0->Echo(123, [&echoed_value](int32_t value) { echoed_value = value; });
   PumpMessages();
   EXPECT_EQ(123, echoed_value);
 
-  AssociatedInterfacePtr<IntegerSender> sender1;
+  IntegerSenderAssociatedPtr sender1;
   connection_ptr->AsyncGetSender(
       [&sender1](AssociatedInterfacePtrInfo<IntegerSender> ptr_info) {
         sender1.Bind(ptr_info.Pass());
       });
   PumpMessages();
   EXPECT_TRUE(sender1);
 
   sender1->Echo(456, [&echoed_value](int32_t value) { echoed_value = value; });
   PumpMessages();
   EXPECT_EQ(456, echoed_value);
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace mojo