[inspector] don't use String16 in inspector test runner

test/inspector/task-runner.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_TEST_INSPECTOR_PROTOCOL_TASK_RUNNER_H_
 #define V8_TEST_INSPECTOR_PROTOCOL_TASK_RUNNER_H_
 
 #include "include/v8-inspector.h"
 #include "include/v8-platform.h"
 #include "include/v8.h"
 #include "src/base/macros.h"
 #include "src/base/platform/platform.h"
-#include "src/inspector/string-16.h"
 #include "src/locked-queue-inl.h"
+#include "src/vector.h"
 
 class TaskRunner : public v8::base::Thread {
  public:
   class Task {
    public:
     virtual ~Task() {}
     virtual bool is_inspector_task() = 0;
     virtual void Run(v8::Isolate* isolate,
                      const v8::Global<v8::Context>& context) = 0;
   };
@@ skipping 33 matching lines @@
   v8::internal::LockedQueue<Task*> deffered_queue_;
   v8::base::Semaphore process_queue_semaphore_;
 
   int nested_loop_count_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskRunner);
 };
 
 class ExecuteStringTask : public TaskRunner::Task {
  public:
-  explicit ExecuteStringTask(const v8_inspector::String16& expression);
+  explicit ExecuteStringTask(const v8::internal::Vector<uint16_t>& expression);
+  explicit ExecuteStringTask(
+      const v8::internal::Vector<const char>& expression);
   bool is_inspector_task() override { return false; }
 
   void Run(v8::Isolate* isolate,
            const v8::Global<v8::Context>& context) override;
 
  private:
-  v8_inspector::String16 expression_;
+  v8::internal::Vector<uint16_t> expression_;
+  v8::internal::Vector<const char> expression_utf8_;
 
   DISALLOW_COPY_AND_ASSIGN(ExecuteStringTask);
 };
 
 #endif  //  V8_TEST_INSPECTOR_PROTOCOL_TASK_RUNNER_H_