Fix mouse wheel scrolling on PDFs.

content/browser/renderer_host/render_widget_host_view_aura_unittest.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 "content/browser/renderer_host/render_widget_host_view_aura.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <utility>
 
@@ skipping 4090 matching lines @@
   // Simulates the mouse wheel event with no modifier applied.
   event = ui::MouseWheelEvent(gfx::Vector2d(1, 1), gfx::Point(), gfx::Point(),
                               ui::EventTimeForNow(), ui::EF_NONE, 0);
 
   view_->OnMouseEvent(&event);
 
   input_event = GetInputEventFromMessage(*sink_->GetMessageAt(0));
   wheel_event = static_cast<const WebMouseWheelEvent*>(input_event);
   // Check if the canScroll set to true when no modifier is applied to the
   // mouse wheel event.
-  EXPECT_EQ(!UseGestureBasedWheelScrolling(), wheel_event->canScroll);
+  EXPECT_TRUE(wheel_event->canScroll);
   sink_->ClearMessages();
 
   SendInputEventACK(blink::WebInputEvent::MouseWheel,
       INPUT_EVENT_ACK_STATE_CONSUMED);
 
   // Simulates the scroll event with ctrl modifier applied.
   ui::ScrollEvent scroll(ui::ET_SCROLL, gfx::Point(2, 2), ui::EventTimeForNow(),
                          ui::EF_CONTROL_DOWN, 0, 5, 0, 5, 2);
   view_->OnScrollEvent(&scroll);
 
   input_event = GetInputEventFromMessage(*sink_->GetMessageAt(0));
   wheel_event = static_cast<const WebMouseWheelEvent*>(input_event);
   // Check if the canScroll set to true when ctrl-touchpad-scroll is generated
   // from scroll event.
-  EXPECT_EQ(!UseGestureBasedWheelScrolling(), wheel_event->canScroll);
+  EXPECT_TRUE(wheel_event->canScroll);
 }
 
 // Ensures that the mapping from ui::TouchEvent to blink::WebTouchEvent doesn't
 // lose track of the number of acks required.
 TEST_F(RenderWidgetHostViewAuraTest, CorrectNumberOfAcksAreDispatched) {
   view_->InitAsFullscreen(parent_view_);
   view_->Show();
   view_->UseFakeDispatcher();
 
   ui::TouchEvent press1(ui::ET_TOUCH_PRESSED, gfx::Point(30, 30), 0,
@@ skipping 332 matching lines @@
   view()->OnGestureEvent(&gesture_event);
 
   EXPECT_TRUE(delegate->context_menu_request_received());
   EXPECT_EQ(delegate->context_menu_source_type(), ui::MENU_SOURCE_TOUCH);
 #endif
 
   RenderViewHostFactory::set_is_real_render_view_host(false);
 }
 
 }  // namespace content