Fix ARM build on mac.

Remove a couple unused vars left behind after r16676. Clang on mac
is pickier than gcc on linux, specifically gcc does not complain about
unused class member variables.

BUG=
R=danno@chromium.org

Review URL: https://codereview.chromium.org/39193003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17356 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/regexp-macro-assembler-arm.h

@@ -223,11 +223,6 @@ class RegExpMacroAssemblerARM: public NativeRegExpMacroAssembler {
   // are always 0..num_saved_registers_-1)
   int num_saved_registers_;
 
-  // Manage a small pre-allocated pool for writing label targets
-  // to for pushing backtrack addresses.
-  int backtrack_constant_pool_offset_;
-  int backtrack_constant_pool_capacity_;
-
   // Labels used internally.
   Label entry_label_;
   Label start_label_;