Remove unused debugger API.

src/debug.cc

Index: src/debug.cc
diff --git a/src/debug.cc b/src/debug.cc
index 3ecf8bada73ee24de75b07fadabd801c075b0299..4badcba8c68e8618525e92a8424c359fe6abe10a 100644
--- a/src/debug.cc
+++ b/src/debug.cc
@@ -2675,10 +2675,8 @@ Debugger::Debugger(Isolate* isolate)
       force_debugger_active_(false),
       message_handler_(NULL),
       debugger_unload_pending_(false),
-      host_dispatch_handler_(NULL),
       debug_message_dispatch_handler_(NULL),
       message_dispatch_helper_thread_(NULL),
-      host_dispatch_period_(TimeDelta::FromMilliseconds(100)),
       agent_(NULL),
       command_queue_(isolate->logger(), kQueueInitialSize),
       command_received_(0),
@@ -3150,17 +3148,7 @@ void Debugger::NotifyMessageHandler(v8::DebugEvent event,
   // Process requests from the debugger.
   while (true) {
     // Wait for new command in the queue.
-    if (Debugger::host_dispatch_handler_) {
-      // In case there is a host dispatch - do periodic dispatches.
-      if (!command_received_.WaitFor(host_dispatch_period_)) {
-        // Timout expired, do the dispatch.
-        Debugger::host_dispatch_handler_();
-        continue;
-      }
-    } else {
-      // In case there is no host dispatch - just wait.
-      command_received_.Wait();
-    }
+    command_received_.Wait();
 
     // Get the command from the queue.
     CommandMessage command = command_queue_.Get();
@@ -3302,13 +3290,6 @@ void Debugger::ListenersChanged() {
 }
 
 
-void Debugger::SetHostDispatchHandler(v8::Debug::HostDispatchHandler handler,
-                                      TimeDelta period) {
-  host_dispatch_handler_ = handler;
-  host_dispatch_period_ = period;
-}
-
-
 void Debugger::SetDebugMessageDispatchHandler(
     v8::Debug::DebugMessageDispatchHandler handler, bool provide_locker) {
   LockGuard<Mutex> lock_guard(&dispatch_handler_access_);