Remove some unused variables to fix the linux build.

runtime/vm/dart_api_impl.cc

 // Copyright (c) 2011, 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 "include/dart_api.h"
 
 #include "vm/bigint_operations.h"
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
 #include "vm/dart.h"
@@ skipping 1360 matching lines @@
   }
   String& name = String::Handle(String::New("length"));
   name = Field::GetterName(name);
   const Function& function = Function::Handle(
       Resolver::ResolveDynamic(instance, name, 1, 0));
   if (function.IsNull()) {
     return Api::NewError("List object does not have a 'length' field.");
   }
 
   GrowableArray<const Object*> args(0);
-  Dart_Handle result;
   const Array& kNoArgumentNames = Array::Handle();
   const Object& retval = Object::Handle(
       DartEntry::InvokeDynamic(instance, function, args, kNoArgumentNames));
   if (retval.IsSmi() || retval.IsMint()) {
     Integer& integer = Integer::Handle();
     integer ^= retval.raw();
     *len = integer.AsInt64Value();
     return Api::Success();
   } else if (retval.IsBigint()) {
     Bigint& bigint = Bigint::Handle();
@@ skipping 200 matching lines @@
   // TODO(5526318): Make access to GrowableObjectArray more efficient.
   // Now check and handle a dart object that implements the List interface.
   const Instance& instance = Instance::Handle(GetListInstance(isolate, obj));
   if (!instance.IsNull()) {
     String& name = String::Handle(String::New("[]="));
     const Function& function = Function::Handle(
         Resolver::ResolveDynamic(instance, name, 3, 0));
     if (!function.IsNull()) {
       Integer& indexobj = Integer::Handle();
       Integer& valueobj = Integer::Handle();
-      Dart_Handle result;
       for (int i = 0; i < length; i++) {
         indexobj = Integer::New(offset + i);
         valueobj = Integer::New(native_array[i]);
         GrowableArray<const Object*> args(2);
         args.Add(&indexobj);
         args.Add(&valueobj);
         const Array& kNoArgumentNames = Array::Handle();
         const Object& result = Object::Handle(
             DartEntry::InvokeDynamic(
                 instance, function, args, kNoArgumentNames));
@@ skipping 126 matching lines @@
       const char* format = "Unable to find entrypoint: static %s.%s()";
       intptr_t length = OS::SNPrint(NULL, 0, format,
                                     class_name.ToCString(),
                                     function_name.ToCString());
       msg = reinterpret_cast<char*>(Api::Allocate(length + 1));
       OS::SNPrint(msg, (length + 1), format,
                   class_name.ToCString(), function_name.ToCString());
     }
     return Api::NewError(msg);
   }
-  Dart_Handle retval;
   GrowableArray<const Object*> dart_arguments(number_of_arguments);
   for (int i = 0; i < number_of_arguments; i++) {
     const Object& arg = Object::Handle(Api::UnwrapHandle(arguments[i]));
     dart_arguments.Add(&arg);
   }
   const Array& kNoArgumentNames = Array::Handle();
   const Object& result = Object::Handle(
       DartEntry::InvokeStatic(function, dart_arguments, kNoArgumentNames));
   return Api::NewLocalHandle(result);
 }
@@ skipping 24 matching lines @@
   const Function& function = Function::Handle(
       Resolver::ResolveDynamic(receiver,
                                name,
                                (number_of_arguments + 1),
                                0));  // Named args not yet supported in API.
   if (function.IsNull()) {
     // TODO(5415268): Invoke noSuchMethod instead of failing.
     OS::PrintErr("Unable to find instance function: %s\n", name.ToCString());
     return Api::NewError("Unable to find instance function");
   }
-  Dart_Handle retval;
   GrowableArray<const Object*> dart_arguments(number_of_arguments);
   for (int i = 0; i < number_of_arguments; i++) {
     const Object& arg = Object::Handle(Api::UnwrapHandle(arguments[i]));
     dart_arguments.Add(&arg);
   }
   const Array& kNoArgumentNames = Array::Handle();
   const Object& result = Object::Handle(
       DartEntry::InvokeDynamic(
           receiver, function, dart_arguments, kNoArgumentNames));
   return Api::NewLocalHandle(result);
@@ skipping 620 matching lines @@
     }
     delete debug_region;
   } else {
     *buffer = NULL;
     *buffer_size = 0;
   }
 }
 
 
 }  // namespace dart