Clean up GestureEventDetails constructors

ash/system/overview/overview_button_tray_unittest.cc

 // Copyright 2014 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 "ash/system/overview/overview_button_tray.h"
 
 #include "ash/display/display_manager.h"
 #include "ash/root_window_controller.h"
 #include "ash/shelf/shelf_types.h"
 #include "ash/shelf/shelf_widget.h"
@@ skipping 60 matching lines @@
 }
 
 // Tests that activating this control brings up window selection mode.
 TEST_F(OverviewButtonTrayTest, PerformAction) {
   ASSERT_FALSE(Shell::GetInstance()->window_selector_controller()->
       IsSelecting());
 
   // Overview Mode only works when there is a window
   scoped_ptr<aura::Window> window(
       CreateTestWindowInShellWithBounds(gfx::Rect(5, 5, 20, 20)));
-  ui::GestureEvent tap(0, 0, 0, base::TimeDelta(),
-      ui::GestureEventDetails(ui::ET_GESTURE_TAP, 0.0f, 0.0f));
+  ui::GestureEvent tap(
+      0, 0, 0, base::TimeDelta(), ui::GestureEventDetails(ui::ET_GESTURE_TAP));
   GetTray()->PerformAction(tap);
   EXPECT_TRUE(Shell::GetInstance()->window_selector_controller()->
       IsSelecting());
 }
 
 // Tests that a second OverviewButtonTray has been created, and only shows
 // when MaximizeMode has been enabled,  when we are using multiple displays.
 // By default the DisplayManger is in extended mode.
 TEST_F(OverviewButtonTrayTest, DisplaysOnBothDisplays) {
   if (!SupportsMultipleDisplays())
@@ skipping 34 matching lines @@
   EXPECT_FALSE(GetTray()->visible());
   SetUserLoggedIn(true);
   SetSessionStarted(true);
   Shell::GetInstance()->UpdateAfterLoginStatusChange(user::LOGGED_IN_USER);
   EXPECT_TRUE(GetTray()->visible());
   Shell::GetInstance()->maximize_mode_controller()->
       EnableMaximizeModeWindowManager(false);
 }
 
 }  // namespace ash