Clean up compiler dispatcher job a bit

src/compiler-dispatcher/compiler-dispatcher-job.h

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_DISPATCHER_COMPILER_DISPATCHER_JOB_H_
 #define V8_COMPILER_DISPATCHER_COMPILER_DISPATCHER_JOB_H_
 
 #include <memory>
 
-#include "src/base/atomic-utils.h"
 #include "src/base/macros.h"
 #include "src/handles.h"
 
 namespace v8 {
 namespace internal {
 
 class CompilationInfo;
 class Isolate;
 class JSFunction;
 class ParseInfo;
 class Parser;
 class UnicodeCache;
 class Utf16CharacterStream;
 class Zone;
 
 enum class CompileJobStatus {
   kInitial,
   kReadyToParse,
   kParsed,
 };
 
 class CompilerDispatcherJob {
  public:
   CompilerDispatcherJob(Isolate* isolate, Handle<JSFunction> function,
                         size_t max_stack_size);
   ~CompilerDispatcherJob();
 
-  CompileJobStatus status() const { return status_.Value(); }
+  CompileJobStatus status() const { return status_; }
   bool can_parse_on_background_thread() const {
     return can_parse_on_background_thread_;
   }
 
   // Transition from kInitial to kReadyToParse.
   void PrepareToParseOnMainThread();
 
   // Transition from kReadyToParse to kParsed.
   void Parse();
 
  private:
-  base::AtomicValue<CompileJobStatus> status_ =
-      base::AtomicValue<CompileJobStatus>(CompileJobStatus::kInitial);
+  CompileJobStatus status_ = CompileJobStatus::kInitial;
   Isolate* isolate_;
   Handle<JSFunction> function_;  // Global handle.
   size_t max_stack_size_;
 
   // Members required for parsing.
   std::unique_ptr<UnicodeCache> unicode_cache_;
   std::unique_ptr<Zone> zone_;
   std::unique_ptr<Utf16CharacterStream> character_stream_;
   std::unique_ptr<ParseInfo> parse_info_;
   std::unique_ptr<Parser> parser_;
 
   bool can_parse_on_background_thread_;
 
   DISALLOW_COPY_AND_ASSIGN(CompilerDispatcherJob);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_DISPATCHER_COMPILER_DISPATCHER_JOB_H_