Change how debugger handles source breakpoints

runtime/vm/json_stream.cc

 // Copyright (c) 2013, 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 "platform/assert.h"
 #include "vm/object.h"
 #include "vm/debugger.h"
 #include "vm/json_stream.h"
 
 
@@ skipping 115 matching lines @@
 
 
 void JSONStream::PrintValue(const Field& field,
                             const Instance& instance,
                             bool ref) {
   PrintCommaIfNeeded();
   field.PrintToJSONStreamWithInstance(this, instance, ref);
 }
 
 
-void JSONStream::PrintValue(const SourceBreakpoint* bpt) {
+void JSONStream::PrintValue(SourceBreakpoint* bpt) {
   PrintCommaIfNeeded();
   bpt->PrintToJSONStream(this);
 }
 
 
 void JSONStream::PrintPropertyBool(const char* name, bool b) {
   PrintPropertyName(name);
   PrintValueBool(b);
 }
 
@@ skipping 118 matching lines @@
   intptr_t len2 = OS::VSNPrint(p, len+1, format, args);
   va_end(args);
   ASSERT(len == len2);
   stream_->buffer_.AddChar('"');
   stream_->buffer_.AddEscapedString(p);
   stream_->buffer_.AddChar('"');
   free(p);
 }
 
 }  // namespace dart