Change how PepperMessageFilter is constructed, to simplify its use.

content/browser/renderer_host/pepper/pepper_tcp_socket.cc

Index: content/browser/renderer_host/pepper/pepper_tcp_socket.cc
===================================================================
--- content/browser/renderer_host/pepper/pepper_tcp_socket.cc	(revision 155271)
+++ content/browser/renderer_host/pepper/pepper_tcp_socket.cc	(working copy)
@@ -69,7 +69,8 @@
     socket_->Disconnect();
 }
 
-void PepperTCPSocket::Connect(const std::string& host, uint16_t port) {
+void PepperTCPSocket::Connect(const std::string& host, uint16_t port,
+                              net::HostResolver* host_resolver) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
   if (connection_state_ != BEFORE_CONNECT) {
@@ -79,8 +80,7 @@
 
   connection_state_ = CONNECT_IN_PROGRESS;
   net::HostResolver::RequestInfo request_info(net::HostPortPair(host, port));
-  resolver_.reset(new net::SingleRequestHostResolver(
-      manager_->GetHostResolver()));
+  resolver_.reset(new net::SingleRequestHostResolver(host_resolver));
   int result = resolver_->Resolve(
       request_info, &address_list_,
       base::Bind(&PepperTCPSocket::OnResolveCompleted, base::Unretained(this)),