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

ppapi/proxy/plugin_globals.cc

Index: ppapi/proxy/plugin_globals.cc
diff --git a/ppapi/proxy/plugin_globals.cc b/ppapi/proxy/plugin_globals.cc
index d361ae1191950b56cf9844ab0aa0983536199bf8..d34adf1e634798427f4c641da7c9a861c27a9f64 100644
--- a/ppapi/proxy/plugin_globals.cc
+++ b/ppapi/proxy/plugin_globals.cc
@@ -13,9 +13,14 @@
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/proxy/ppb_message_loop_proxy.h"
 #include "ppapi/proxy/resource_reply_thread_registrar.h"
-#include "ppapi/shared_impl/ppapi_constants.h"
 #include "ppapi/shared_impl/proxy_lock.h"
 #include "ppapi/thunk/enter.h"
+
+namespace {
+
+const int kKeepaliveThrottleIntervalDefault = 5000;
+
+}  // namespace
 
 namespace ppapi {
 namespace proxy {
@@ -59,7 +64,7 @@
           new ResourceReplyThreadRegistrar(GetMainThreadMessageLoop())),
       plugin_recently_active_(false),
       keepalive_throttle_interval_milliseconds_(
-          ppapi::kKeepaliveThrottleIntervalDefaultMilliseconds),
+          kKeepaliveThrottleIntervalDefault),
       weak_factory_(this) {
   DCHECK(!plugin_globals_);
   plugin_globals_ = this;
@@ -80,7 +85,7 @@
           new ResourceReplyThreadRegistrar(GetMainThreadMessageLoop())),
       plugin_recently_active_(false),
       keepalive_throttle_interval_milliseconds_(
-          kKeepaliveThrottleIntervalDefaultMilliseconds),
+          kKeepaliveThrottleIntervalDefault),
       weak_factory_(this) {
   DCHECK(!plugin_globals_);
 }
@@ -181,13 +186,12 @@
     if (!GetBrowserSender() || !base::MessageLoop::current())
       return;
     GetBrowserSender()->Send(new PpapiHostMsg_Keepalive());
-    DCHECK(keepalive_throttle_interval_milliseconds_);
-    GetMainThreadMessageLoop()->PostDelayedTask(
-        FROM_HERE,
+
+    GetMainThreadMessageLoop()->PostDelayedTask(FROM_HERE,
         RunWhileLocked(base::Bind(&PluginGlobals::OnReleaseKeepaliveThrottle,
                                   weak_factory_.GetWeakPtr())),
         base::TimeDelta::FromMilliseconds(
-            keepalive_throttle_interval_milliseconds_));
+            keepalive_throttle_interval_milliseconds()));
   }
 }
 
@@ -221,7 +225,11 @@
   return loop_for_main_thread_.get();
 }
 
-void PluginGlobals::set_keepalive_throttle_interval_milliseconds(unsigned i) {
+int PluginGlobals::keepalive_throttle_interval_milliseconds() const {
+  return keepalive_throttle_interval_milliseconds_;
+}
+
+void PluginGlobals::set_keepalive_throttle_interval_milliseconds(int i) {
   keepalive_throttle_interval_milliseconds_ = i;
 }