VM: Remove unused private field to 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/address_sanitizer.h"
 #include "platform/memory_sanitizer.h"
 #include "platform/utils.h"
 
 #include "vm/allocation.h"
 #include "vm/atomic.h"
@@ skipping 421 matching lines @@
 
  private:
   Sample* sample_;
   DartFrameIterator frame_iterator_;
 };
 
 
 // Executing Dart code, walk the stack.
 class ProfilerDartStackWalker : public ValueObject {
  public:
-  ProfilerDartStackWalker(Isolate* isolate,
-                          Sample* sample,
+  ProfilerDartStackWalker(Sample* sample,
                           uword stack_lower,
                           uword stack_upper,
                           uword pc,
                           uword fp,
                           uword sp)
-      : isolate_(isolate),
-        sample_(sample),
+      : sample_(sample),
         stack_upper_(stack_upper),
         stack_lower_(stack_lower) {
     ASSERT(sample_ != NULL);
     pc_ = reinterpret_cast<uword*>(pc);
     fp_ = reinterpret_cast<uword*>(fp);
     sp_ = reinterpret_cast<uword*>(sp);
   }
 
   void walk() {
     sample_->set_exit_frame_sample(false);
@@ skipping 115 matching lines @@
       return false;
     }
     uword cursor = reinterpret_cast<uword>(fp);
     cursor += sizeof(fp);
     return (cursor >= stack_lower_) && (cursor < stack_upper_);
   }
 
   uword* pc_;
   uword* fp_;
   uword* sp_;
-  Isolate* isolate_;
   Sample* sample_;
   const uword stack_upper_;
   uword stack_lower_;
 };
 
 
 // If the VM is compiled without frame pointers (which is the default on
 // recent GCC versions with optimizing enabled) the stack walking code may
 // fail.
 //
@@ skipping 409 matching lines @@
 
   ProfilerNativeStackWalker native_stack_walker(sample,
                                                 stack_lower,
                                                 stack_upper,
                                                 pc,
                                                 fp,
                                                 sp);
 
   ProfilerDartExitStackWalker dart_exit_stack_walker(isolate, sample);
 
-  ProfilerDartStackWalker dart_stack_walker(isolate,
-                                            sample,
+  ProfilerDartStackWalker dart_stack_walker(sample,
                                             stack_lower,
                                             stack_upper,
                                             pc,
                                             fp,
                                             sp);
 
   // All memory access is done inside CollectSample.
   CollectSample(isolate,
                 exited_dart_code,
                 in_dart_code,
@@ skipping 199 matching lines @@
                                                uword pc) {
   return vm_isolate->heap()->CodeContains(pc)
          || isolate->heap()->CodeContains(pc);
 }
 
 
 ProcessedSampleBuffer::ProcessedSampleBuffer() {
 }
 
 }  // namespace dart