Introduce IPC::ChannelProxy::Create*() and IPC::SynChannel::Create*()

ppapi/proxy/proxy_channel.cc

Index: ppapi/proxy/proxy_channel.cc
diff --git a/ppapi/proxy/proxy_channel.cc b/ppapi/proxy/proxy_channel.cc
index b7f8a826ce3245bfbf40d203f642b3f58d64514e..db2a30f8094b69d8c9c1df7106c3b2ea6c423b68 100644
--- a/ppapi/proxy/proxy_channel.cc
+++ b/ppapi/proxy/proxy_channel.cc
@@ -31,11 +31,14 @@ bool ProxyChannel::InitWithChannel(Delegate* delegate,
                                    bool is_client) {
   delegate_ = delegate;
   peer_pid_ = peer_pid;
-  IPC::Channel::Mode mode = is_client ? IPC::Channel::MODE_CLIENT
-                                      : IPC::Channel::MODE_SERVER;
-  channel_.reset(new IPC::SyncChannel(channel_handle, mode, this,
-                                      delegate->GetIPCMessageLoop(), true,
-                                      delegate->GetShutdownEvent()));
+  channel_ = IPC::SyncChannel::Create(
+      this,
+      delegate->GetIPCMessageLoop(),
+      delegate->GetShutdownEvent());
+  if (is_client)
+    channel_->InitClient(channel_handle, true);
+  else
+    channel_->InitServer(channel_handle, true);
   return true;
 }