Remove unused variable to please GCC 4.6.

src/api.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 4157 matching lines @@
   if (!result->ToObject(&object_func)) {
     return;
   }
 
   if (object_func->IsJSFunction()) {
     i::Handle<i::JSFunction> func =
         i::Handle<i::JSFunction>(i::JSFunction::cast(object_func));
 
     // Call ResetDateCache(0 but expect no exceptions:
     bool caught_exception = false;
-    i::Handle<i::Object> result =
-        i::Execution::TryCall(func, isolate->js_builtins_object(), 0, NULL,
-        &caught_exception);
+    i::Execution::TryCall(func,
+                          isolate->js_builtins_object(),
+                          0,
+                          NULL,
+                          &caught_exception);
   }
 }
 
 
 static i::Handle<i::String> RegExpFlagsToString(RegExp::Flags flags) {
   char flags_buf[3];
   int num_flags = 0;
   if ((flags & RegExp::kGlobal) != 0) flags_buf[num_flags++] = 'g';
   if ((flags & RegExp::kMultiline) != 0) flags_buf[num_flags++] = 'm';
   if ((flags & RegExp::kIgnoreCase) != 0) flags_buf[num_flags++] = 'i';
@@ skipping 1449 matching lines @@
 
 
 char* HandleScopeImplementer::Iterate(ObjectVisitor* v, char* storage) {
   HandleScopeImplementer* scope_implementer =
       reinterpret_cast<HandleScopeImplementer*>(storage);
   scope_implementer->IterateThis(v);
   return storage + ArchiveSpacePerThread();
 }
 
 } }  // namespace v8::internal