[Chromoting] Use HostExperimentSessionPlugin in host

remoting/host/host_session_options.cc

Index: remoting/host/host_session_options.cc
diff --git a/remoting/host/host_session_options.cc b/remoting/host/host_session_options.cc
index 2424b88e7b5292dae9b8f173a7a6eaf5179a34b3..8511f278ceddc6d297a55a4378d16ee19bf00edf 100644
--- a/remoting/host/host_session_options.cc
+++ b/remoting/host/host_session_options.cc
@@ -11,7 +11,6 @@
 #include "base/strings/string_util.h"
 
 namespace remoting {
-namespace protocol {
 
 namespace {
 
@@ -35,6 +34,10 @@ bool KeyIsValid(const std::string& key) {
 HostSessionOptions::HostSessionOptions() = default;
 HostSessionOptions::~HostSessionOptions() = default;
 
+HostSessionOptions::HostSessionOptions(const std::string& parameter) {
+  Import(parameter);
+}
+
 void HostSessionOptions::Append(const std::string& key,
                                 const std::string& value) {
   DCHECK(KeyIsValid(key));
@@ -80,5 +83,4 @@ void HostSessionOptions::Import(const std::string& parameter) {
   }
 }
 
-}  // namespace protocol
 }  // namespace remoting