src: remove process._debugPause()

This method is undocumented and depends on a V8 API that is slated for
removal.  The inspector and node-inspect don't use it and I could find
no third-party code that depends on it.  Remove it.

PR-URL: #17060
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>

src/node.cc

@@ -67,7 +67,6 @@
 #if NODE_USE_V8_PLATFORM
 #include "libplatform/libplatform.h"
 #endif  // NODE_USE_V8_PLATFORM
-#include "v8-debug.h"
 #include "v8-profiler.h"
 #include "zlib.h"
 
@@ -2931,7 +2930,6 @@ static void DebugPortSetter(Local<Name> property,
 
 
 static void DebugProcess(const FunctionCallbackInfo<Value>& args);
-static void DebugPause(const FunctionCallbackInfo<Value>& args);
 static void DebugEnd(const FunctionCallbackInfo<Value>& args);
 
 namespace {
@@ -3363,7 +3361,6 @@ void SetupProcessObject(Environment* env,
   env->SetMethod(process, "_kill", Kill);
 
   env->SetMethod(process, "_debugProcess", DebugProcess);
-  env->SetMethod(process, "_debugPause", DebugPause);
   env->SetMethod(process, "_debugEnd", DebugEnd);
 
   env->SetMethod(process, "hrtime", Hrtime);
@@ -4091,11 +4088,6 @@ static void DebugProcess(const FunctionCallbackInfo<Value>& args) {
 #endif  // _WIN32
 
 
-static void DebugPause(const FunctionCallbackInfo<Value>& args) {
-  v8::Debug::DebugBreak(args.GetIsolate());
-}
-
-
 static void DebugEnd(const FunctionCallbackInfo<Value>& args) {
 #if HAVE_INSPECTOR
   Environment* env = Environment::GetCurrent(args);