Change overscroll functions to pass floats.

content/browser/web_contents/web_contents_view_aura_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 "content/browser/web_contents/web_contents_view_aura.h"
 
 #include "base/command_line.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/test/test_timeouts.h"
@@ skipping 59 matching lines @@
   void Reset() {
     count_ = 0;
     completed_ = false;
   }
 
  private:
   virtual bool CanOverscrollContent() const override {
     return true;
   }
 
-  virtual void OverscrollUpdate(int delta_y) override {
+  virtual void OverscrollUpdate(float delta_y) override {
     ++count_;
   }
 
   virtual void OverscrollComplete() override {
     completed_ = true;
   }
 
   int count_;
   bool completed_;
 
@@ skipping 1057 matching lines @@
     details = dispatcher->OnEventFromSource(&release);
     ASSERT_FALSE(details.dispatcher_destroyed);
     WaitAFrame();
 
     EXPECT_LT(0, tracker.num_overscroll_updates());
     EXPECT_FALSE(tracker.overscroll_completed());
   }
 }
 
 }  // namespace content