Debugger: remove debug command API.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index c76f826ae9eb4ff76387732b74d3e0bc012fd21a..f930a010c65f3ff7d656445709e84189825e9cc5 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -7363,12 +7363,6 @@ bool Debug::CheckDebugBreak(Isolate* isolate) {
 }
 
 
-void Debug::DebugBreakForCommand(Isolate* isolate, ClientData* data) {
-  i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
-  internal_isolate->debug()->EnqueueDebugCommand(data);
-}
-
-
 void Debug::SetMessageHandler(v8::Debug::MessageHandler handler) {
   i::Isolate* isolate = i::Isolate::Current();
   ENTER_V8(isolate);