Roll back all step-in-fix-related changes

src/mips/debug-mips.cc

Index: src/mips/debug-mips.cc
diff --git a/src/mips/debug-mips.cc b/src/mips/debug-mips.cc
index 47961fac7e29b8cdbf684fc9cecc7cb9610122fa..8c40930c59d740c7e757bb3021ee85b767e8b235 100644
--- a/src/mips/debug-mips.cc
+++ b/src/mips/debug-mips.cc
@@ -117,10 +117,9 @@ void Debug::GenerateFrameDropperLiveEdit(MacroAssembler* masm) {
 #undef __
 
 
-Object** Debug::SetUpFrameDropperFrame(StackFrame* bottom_js_frame,
-                                       Handle<Code> code) {
+void Debug::SetUpFrameDropperFrame(StackFrame* bottom_js_frame,
+                                   Handle<Code> code) {
   UNREACHABLE();
-  return NULL;
 }
 const int Debug::kFrameDropperFrameSize = -1;