Introduce IPC::Channel::Create*() to ensure it being heap-allocated.

ipc/ipc_channel_proxy_unittest.cc

Index: ipc/ipc_channel_proxy_unittest.cc
diff --git a/ipc/ipc_channel_proxy_unittest.cc b/ipc/ipc_channel_proxy_unittest.cc
index bd2381caeb96b865288d2b15df105d3b42ae3e19..20e42e30224efbb57dfd8970472c18d714983816 100644
--- a/ipc/ipc_channel_proxy_unittest.cc
+++ b/ipc/ipc_channel_proxy_unittest.cc
@@ -428,11 +428,11 @@ TEST_F(IPCChannelBadMessageTest, BadMessage) {
 MULTIPROCESS_IPC_TEST_CLIENT_MAIN(ChannelProxyClient) {
   base::MessageLoopForIO main_message_loop;
   ChannelReflectorListener listener;
-  IPC::Channel channel(IPCTestBase::GetChannelName("ChannelProxyClient"),
-                       IPC::Channel::MODE_CLIENT,
-                       &listener);
-  CHECK(channel.Connect());
-  listener.Init(&channel);
+  scoped_ptr<IPC::Channel> channel(IPC::Channel::CreateClient(
+      IPCTestBase::GetChannelName("ChannelProxyClient"),
+      &listener));
+  CHECK(channel->Connect());
+  listener.Init(channel.get());
 
   base::MessageLoop::current()->Run();
   return 0;