[debug] mark more unused debug API as deprecated.

src/debug/debug.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/debug/debug.h"
 
 #include <memory>
 
 #include "src/api.h"
 #include "src/arguments.h"
@@ skipping 1755 matching lines @@
   // Process debug event.
   ProcessDebugEvent(v8::Break, Handle<JSObject>::cast(event_data));
 }
 
 
 void Debug::OnCompileError(Handle<Script> script) {
   ProcessCompileEvent(v8::CompileError, script);
 }
 
 
-void Debug::OnBeforeCompile(Handle<Script> script) {
-  ProcessCompileEvent(v8::BeforeCompile, script);
-}
-
-
 // Handle debugger actions when a new script is compiled.
 void Debug::OnAfterCompile(Handle<Script> script) {
   ProcessCompileEvent(v8::AfterCompile, script);
 }
 
 void Debug::OnAsyncTaskEvent(Handle<String> type, Handle<Object> id,
                              Handle<String> name) {
   DCHECK(id->IsNumber());
   if (in_debug_scope() || ignore_events()) return;
 
@@ skipping 339 matching lines @@
 v8::Debug::ClientData* EventDetailsImpl::GetClientData() const {
   return client_data_;
 }
 
 v8::Isolate* EventDetailsImpl::GetIsolate() const {
   return reinterpret_cast<v8::Isolate*>(exec_state_->GetIsolate());
 }
 
 }  // namespace internal
 }  // namespace v8