Remove special debug ExternalReferences.

src/ia32/debug-ia32.cc

Index: src/ia32/debug-ia32.cc
diff --git a/src/ia32/debug-ia32.cc b/src/ia32/debug-ia32.cc
index e7a7b6058153dddef621cb93de2af35e5d0cec8f..d9d970ef0433c580637a60e881525a46c6ccc6ec 100644
--- a/src/ia32/debug-ia32.cc
+++ b/src/ia32/debug-ia32.cc
@@ -167,7 +167,7 @@ static void Generate_DebugBreakCallHelper(MacroAssembler* masm,
   // jumping to the target address intended by the caller and that was
   // overwritten by the address of DebugBreakXXX.
   ExternalReference after_break_target =
-      ExternalReference(Debug_Address::AfterBreakTarget(), masm->isolate());
+      ExternalReference::debug_after_break_target_address(masm->isolate());
   __ jmp(Operand::StaticVariable(after_break_target));
 }
 
@@ -308,8 +308,8 @@ void Debug::GeneratePlainReturnLiveEdit(MacroAssembler* masm) {
 
 void Debug::GenerateFrameDropperLiveEdit(MacroAssembler* masm) {
   ExternalReference restarter_frame_function_slot =
-      ExternalReference(Debug_Address::RestarterFrameFunctionPointer(),
-                        masm->isolate());
+      ExternalReference::debug_restarter_frame_function_pointer_address(
+          masm->isolate());
   __ mov(Operand::StaticVariable(restarter_frame_function_slot), Immediate(0));
 
   // We do not know our frame height, but set esp based on ebp.