Merge SafeStackTraceFrameIterator into SafeStackFrameIterator

src/frames-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 306 matching lines @@
   // TODO(1233797): The frame hierarchy needs to change. It's
   // problematic that we can't use the safe-cast operator to cast to
   // the JavaScript frame type, because we may encounter arguments
   // adaptor frames.
   StackFrame* frame = iterator_.frame();
   ASSERT(frame->is_java_script() || frame->is_arguments_adaptor());
   return static_cast<JavaScriptFrame*>(frame);
 }
 
 
-inline JavaScriptFrame* SafeStackTraceFrameIterator::frame() const {
+inline JavaScriptFrame* SafeStackFrameIterator::frame() const {
+  ASSERT(!iteration_done_);
   // TODO(1233797): The frame hierarchy needs to change. It's
   // problematic that we can't use the safe-cast operator to cast to
   // the JavaScript frame type, because we may encounter arguments
   // adaptor frames.
   StackFrame* frame = iterator_.frame();
   ASSERT(frame->is_java_script());
   return static_cast<JavaScriptFrame*>(frame);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_FRAMES_INL_H_