Revert of 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 980cc6ee8ab71d6cb677c48389fbde84dff72f2b..a3ea6c1835ca5fb1afd8540fedcfda73e3dc15af 100644
--- a/ppapi/proxy/plugin_main_irt.cc
+++ b/ppapi/proxy/plugin_main_irt.cc
@@ -32,6 +32,7 @@
 #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__)
@@ -115,6 +116,8 @@
   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_;
@@ -246,10 +249,7 @@
   logging::LoggingSettings settings;
   settings.logging_dest = logging::LOG_TO_SYSTEM_DEBUG_LOG;
   logging::InitLogging(settings);
-
-  ppapi::proxy::PluginGlobals::Get()
-      ->set_keepalive_throttle_interval_milliseconds(
-          args.keepalive_throttle_interval_milliseconds);
+  SetPpapiKeepAliveThrottleFromCommandLine();
 
   // Tell the process-global GetInterface which interfaces it can return to the
   // plugin.
@@ -294,6 +294,18 @@
     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) {