[chromedriver] Set page load strategy via constructor rather than a setter.

chrome/test/chromedriver/chrome/chrome_impl.h

Index: chrome/test/chromedriver/chrome/chrome_impl.h
diff --git a/chrome/test/chromedriver/chrome/chrome_impl.h b/chrome/test/chromedriver/chrome/chrome_impl.h
index 1e0318aa2811071f6966577ebd513f8cf87c6f65..17efffd09b7e5b059cac179ff5c4dc896510280b 100644
--- a/chrome/test/chromedriver/chrome/chrome_impl.h
+++ b/chrome/test/chromedriver/chrome/chrome_impl.h
@@ -43,14 +43,14 @@ class ChromeImpl : public Chrome {
   bool IsMobileEmulationEnabled() const override;
   bool HasTouchScreen() const override;
   std::string page_load_strategy() const override;
-  void set_page_load_strategy(std::string strategy) override;
   Status Quit() override;
 
  protected:
   ChromeImpl(std::unique_ptr<DevToolsHttpClient> http_client,
              std::unique_ptr<DevToolsClient> websocket_client,
              ScopedVector<DevToolsEventListener>& devtools_event_listeners,
-             std::unique_ptr<PortReservation> port_reservation);
+             std::unique_ptr<PortReservation> port_reservation,
+             std::string page_load_strategy);
 
   virtual Status QuitImpl() = 0;
 
@@ -59,7 +59,6 @@ class ChromeImpl : public Chrome {
   std::unique_ptr<DevToolsClient> devtools_websocket_client_;
 
  private:
-  std::string page_load_strategy_;
   typedef std::list<linked_ptr<WebViewImpl> > WebViewList;
 
   void UpdateWebViews(const WebViewsInfo& views_info);
@@ -68,6 +67,7 @@ class ChromeImpl : public Chrome {
   WebViewList web_views_;
   ScopedVector<DevToolsEventListener> devtools_event_listeners_;
   std::unique_ptr<PortReservation> port_reservation_;
+  std::string page_load_strategy_;
 };
 
 #endif  // CHROME_TEST_CHROMEDRIVER_CHROME_CHROME_IMPL_H_