Do not clear stepping after DebugEvaluate.

src/runtime/runtime-debug.cc

 // Copyright 2014 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/v8.h"
 
 #include "src/accessors.h"
 #include "src/arguments.h"
 #include "src/compiler.h"
 #include "src/debug.h"
@@ skipping 2384 matching lines @@
       Object);
 
   // Skip the global proxy as it has no properties and always delegates to the
   // real global object.
   if (result->IsJSGlobalProxy()) {
     PrototypeIterator iter(isolate, result);
     // TODO(verwaest): This will crash when the global proxy is detached.
     result = Handle<JSObject>::cast(PrototypeIterator::GetCurrent(iter));
   }
 
-  // Clear the oneshot breakpoints so that the debugger does not step further.
-  isolate->debug()->ClearStepping();
   return result;
 }
 
 
 static Handle<JSObject> NewJSObjectWithNullProto(Isolate* isolate) {
   Handle<JSObject> result =
       isolate->factory()->NewJSObject(isolate->object_function());
   Handle<Map> new_map =
       Map::Copy(Handle<Map>(result->map()), "ObjectWithNullProto");
   Map::SetPrototype(new_map, isolate->factory()->null_value());
@@ skipping 740 matching lines @@
   return Smi::FromInt(isolate->debug()->is_active());
 }
 
 
 RUNTIME_FUNCTION(Runtime_DebugBreakInOptimizedCode) {
   UNIMPLEMENTED();
   return NULL;
 }
 }
 }  // namespace v8::internal