Fix ARM compilation error

src/arm/debug-arm.cc

 // Copyright 2006-2008 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 161 matching lines @@
 
 
 void Debug::GenerateReturnDebugBreak(MacroAssembler* masm) {
   // In places other than IC call sites it is expected that r0 is TOS which
   // is an object - this is not generally the case so this should be used with
   // care.
   Generate_DebugBreakCallHelper(masm, r0.bit());
 }
 
 
-void Debug::GenerateReturnDebugBreakEntry(MacroAssembler* masm) {
-  // Generate nothing as this handling of debug break return is not done this
-  // way on ARM  - yet.
-}
-
-
 void Debug::GenerateStubNoRegistersDebugBreak(MacroAssembler* masm) {
   // Generate nothing as CodeStub CallFunction is not used on ARM.
 }
 
 
 #undef __
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal