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

test/inspector/task-runner.h

Index: test/inspector/task-runner.h
diff --git a/test/inspector/task-runner.h b/test/inspector/task-runner.h
index 88c36543d3785b61c82dd7b808eb353b37c53a9a..fc65ab7cdef3f96f8417bf9a70b077dd5c788659 100644
--- a/test/inspector/task-runner.h
+++ b/test/inspector/task-runner.h
@@ -10,8 +10,8 @@
 #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:
@@ -65,14 +65,17 @@ class TaskRunner : public v8::base::Thread {
 
 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);
 };