Remove DebuggerEvent. Refactor remaining code.

runtime/vm/exceptions.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/exceptions.h"
 
 #include "platform/address_sanitizer.h"
 
 #include "vm/dart_api_impl.h"
 #include "vm/dart_entry.h"
@@ skipping 527 matching lines @@
 
 
 void Exceptions::Throw(Thread* thread, const Instance& exception) {
   // Do not notify debugger on stack overflow and out of memory exceptions.
   // The VM would crash when the debugger calls back into the VM to
   // get values of variables.
   if (FLAG_support_debugger) {
     Isolate* isolate = thread->isolate();
     if (exception.raw() != isolate->object_store()->out_of_memory() &&
         exception.raw() != isolate->object_store()->stack_overflow()) {
-      isolate->debugger()->SignalExceptionThrown(exception);
+      isolate->debugger()->PauseException(exception);
     }
   }
   // Null object is a valid exception object.
   ThrowExceptionHelper(thread, exception,
       Stacktrace::Handle(thread->zone()), false);
 }
 
 void Exceptions::ReThrow(Thread* thread,
                          const Instance& exception,
                          const Instance& stacktrace) {
@@ skipping 157 matching lines @@
   }
 
   return DartLibraryCalls::InstanceCreate(library,
                                           *class_name,
                                           *constructor_name,
                                           arguments);
 }
 
 
 }  // namespace dart