Fix build:

runtime/vm/profiler.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/utils.h"
 
 #include "vm/allocation.h"
 #include "vm/atomic.h"
 #include "vm/code_patcher.h"
 #include "vm/isolate.h"
@@ skipping 843 matching lines @@
 //
 class ProfilerSampleStackWalker : public ValueObject {
  public:
   ProfilerSampleStackWalker(Sample* sample,
                             uword stack_lower,
                             uword stack_upper,
                             uword pc,
                             uword fp,
                             uword sp)
       : sample_(sample),
-        stack_lower_(stack_lower),
         stack_upper_(stack_upper),
         original_pc_(pc),
         original_fp_(fp),
         original_sp_(sp),
         lower_bound_(stack_lower) {
     ASSERT(sample_ != NULL);
   }
 
   int walk() {
     const intptr_t kMaxStep = 0x1000;  // 4K.
@@ skipping 59 matching lines @@
     if (fp == NULL) {
       return false;
     }
     uword cursor = reinterpret_cast<uword>(fp);
     cursor += sizeof(fp);
     bool r = cursor >= lower_bound_ && cursor < stack_upper_;
     return r;
   }
 
   Sample* sample_;
-  const uword stack_lower_;
   const uword stack_upper_;
   const uword original_pc_;
   const uword original_fp_;
   const uword original_sp_;
   uword lower_bound_;
 };
 
 void Profiler::RecordSampleInterruptCallback(
     const InterruptedThreadState& state,
     void* data) {
@@ skipping 19 matching lines @@
     stack_lower = 0;
     stack_upper = 0;
   }
   ProfilerSampleStackWalker stackWalker(sample, stack_lower, stack_upper,
                                         state.pc, state.fp, state.sp);
   stackWalker.walk();
 }
 
 
 }  // namespace dart