Revert of Refactoring button field and its type

chrome/browser/policy/policy_browsertest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
 #include <memory>
 #include <string>
@@ skipping 840 matching lines @@
     base::RunLoop loop;
     loop.RunUntilIdle();
   }
 
   // Sends a mouse click at the given coordinates to the current renderer.
   void PerformClick(int x, int y) {
     content::WebContents* contents =
         browser()->tab_strip_model()->GetActiveWebContents();
     blink::WebMouseEvent click_event;
     click_event.type = blink::WebInputEvent::MouseDown;
-    click_event.button = blink::WebMouseEvent::Button::Left;
+    click_event.button = blink::WebMouseEvent::ButtonLeft;
     click_event.clickCount = 1;
     click_event.x = x;
     click_event.y = y;
     contents->GetRenderViewHost()->GetWidget()->ForwardMouseEvent(click_event);
     click_event.type = blink::WebInputEvent::MouseUp;
     contents->GetRenderViewHost()->GetWidget()->ForwardMouseEvent(click_event);
   }
 
   void SetPolicy(PolicyMap* policies,
                  const char* key,
@@ skipping 3242 matching lines @@
 
   SetEmptyPolicy();
   // Policy not set.
   CheckSystemTimezoneAutomaticDetectionPolicyUnset();
   EXPECT_TRUE(CheckResolveTimezoneByGeolocation(true, false));
   EXPECT_TRUE(manager->TimeZoneResolverShouldBeRunningForTests());
 }
 #endif  // defined(OS_CHROMEOS)
 
 }  // namespace policy