Replace --ppapi-keep-alive-throttle command line switch with IPC parameter.

ppapi/proxy/plugin_main_irt.cc

Index: ppapi/proxy/plugin_main_irt.cc
diff --git a/ppapi/proxy/plugin_main_irt.cc b/ppapi/proxy/plugin_main_irt.cc
index a3ea6c1835ca5fb1afd8540fedcfda73e3dc15af..980cc6ee8ab71d6cb677c48389fbde84dff72f2b 100644
--- a/ppapi/proxy/plugin_main_irt.cc
+++ b/ppapi/proxy/plugin_main_irt.cc
@@ -32,7 +32,6 @@
 #include "ppapi/proxy/plugin_message_filter.h"
 #include "ppapi/proxy/plugin_proxy_delegate.h"
 #include "ppapi/proxy/resource_reply_thread_registrar.h"
-#include "ppapi/shared_impl/ppapi_switches.h"
 #include "ppapi/shared_impl/ppb_audio_shared.h"
 
 #if defined(__native_client__)
@@ -116,8 +115,6 @@ class PpapiDispatcher : public PluginDispatcher::PluginDelegate,
   void OnMsgInitializeNaClDispatcher(const ppapi::PpapiNaClPluginArgs& args);
   void OnPluginDispatcherMessageReceived(const IPC::Message& msg);
 
-  void SetPpapiKeepAliveThrottleFromCommandLine();
-
   std::set<PP_Instance> instances_;
   std::map<uint32, PluginDispatcher*> plugin_dispatchers_;
   uint32 next_plugin_dispatcher_id_;
@@ -249,7 +246,10 @@ void PpapiDispatcher::OnMsgInitializeNaClDispatcher(
   logging::LoggingSettings settings;
   settings.logging_dest = logging::LOG_TO_SYSTEM_DEBUG_LOG;
   logging::InitLogging(settings);
-  SetPpapiKeepAliveThrottleFromCommandLine();
+
+  ppapi::proxy::PluginGlobals::Get()
+      ->set_keepalive_throttle_interval_milliseconds(
+          args.keepalive_throttle_interval_milliseconds);
 
   // Tell the process-global GetInterface which interfaces it can return to the
   // plugin.
@@ -294,18 +294,6 @@ void PpapiDispatcher::OnPluginDispatcherMessageReceived(
     dispatcher->second->OnMessageReceived(msg);
 }
 
-void PpapiDispatcher::SetPpapiKeepAliveThrottleFromCommandLine() {
-  unsigned keepalive_throttle_interval_milliseconds = 0;
-  if (base::StringToUint(
-          CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
-              switches::kPpapiKeepAliveThrottle),
-          &keepalive_throttle_interval_milliseconds)) {
-    ppapi::proxy::PluginGlobals::Get()->
-        set_keepalive_throttle_interval_milliseconds(
-            keepalive_throttle_interval_milliseconds);
-  }
-}
-
 }  // namespace
 
 void SetIPCFileDescriptors(int ipc_browser_fd, int ipc_renderer_fd) {