Remove code doing a no-op due to float -> int rounding.

chrome/browser/gtk/tabs/tab_gtk.cc

 // Copyright (c) 2006-2008 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 "chrome/browser/gtk/tabs/tab_gtk.h"
 
 #include <gdk/gdkkeysyms.h>
 
 #include "app/gtk_dnd_util.h"
 #include "app/gfx/path.h"
@@ skipping 209 matching lines @@
     return;
 
   if (drag_widget_) {
     delegate_->ContinueDrag(NULL);
     return;
   }
 
   GdkEventMotion* motion = reinterpret_cast<GdkEventMotion*>(event);
   GdkEventButton* button = reinterpret_cast<GdkEventButton*>(last_mouse_down_);
   bool dragging = gtk_drag_check_threshold(widget(),
-                                           button->x, button->y,
-                                           motion->x, motion->y);
-  if (dragging)
-    StartDragging(gfx::Point(button->x, button->y));
+                                           static_cast<gint>(button->x),
+                                           static_cast<gint>(button->y),
+                                           static_cast<gint>(motion->x),
+                                           static_cast<gint>(motion->y));
+  if (dragging) {
+    StartDragging(gfx::Point(static_cast<int>(button->x),
+                             static_cast<int>(button->y)));
+  }
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 // TabGtk, TabRendererGtk overrides:
 
 bool TabGtk::IsSelected() const {
   return delegate_->IsTabSelected(this);
 }
 
 bool TabGtk::IsVisible() const {
@@ skipping 85 matching lines @@
     gdk_event_free(last_mouse_down_);
     last_mouse_down_ = NULL;
   }
 
   // Notify the drag helper that we're done with any potential drag operations.
   // Clean up the drag helper, which is re-created on the next mouse press.
   delegate_->EndDrag(canceled);
 
   MessageLoopForUI::current()->RemoveObserver(this);
 }