aura: Make 'ui' buildable without gtk.

ui/gfx/rect.cc

 // Copyright (c) 2011 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 "ui/gfx/rect.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #elif defined(OS_MACOSX)
 #include <CoreGraphics/CGGeometry.h>
-#elif defined(USE_X11)
+#elif defined(TOOLKIT_USES_GTK)
 #include <gdk/gdk.h>
 #endif
 #if defined(USE_WAYLAND)
 #include <cairo.h>
 #endif
 
 #include <ostream>
 
 #include "ui/gfx/insets.h"
 
@@ skipping 51 matching lines @@
   set_width(r.size.width);
   set_height(r.size.height);
 }
 
 Rect& Rect::operator=(const CGRect& r) {
   origin_.SetPoint(r.origin.x, r.origin.y);
   set_width(r.size.width);
   set_height(r.size.height);
   return *this;
 }
-#elif defined(USE_X11)
+#elif defined(TOOLKIT_USES_GTK)
 Rect::Rect(const GdkRectangle& r)
     : origin_(r.x, r.y) {
   set_width(r.width);
   set_height(r.height);
 }
 
 Rect& Rect::operator=(const GdkRectangle& r) {
   origin_.SetPoint(r.x, r.y);
   set_width(r.width);
   set_height(r.height);
@@ skipping 58 matching lines @@
   r.left = x();
   r.right = right();
   r.top = y();
   r.bottom = bottom();
   return r;
 }
 #elif defined(OS_MACOSX)
 CGRect Rect::ToCGRect() const {
   return CGRectMake(x(), y(), width(), height());
 }
-#elif defined(USE_X11)
+#elif defined(TOOLKIT_USES_GTK)
 GdkRectangle Rect::ToGdkRectangle() const {
   GdkRectangle r = {x(), y(), width(), height()};
   return r;
 }
 #endif
 #if defined(USE_WAYLAND)
 cairo_rectangle_int_t Rect::ToCairoRectangle() const {
   cairo_rectangle_int_t r = {x(), y(), width(), height()};
   return r;
 }
@@ skipping 98 matching lines @@
              (x() == rect.right() || right() == rect.x())) ||
          (x() == rect.x() && width() == rect.width() &&
              (y() == rect.bottom() || bottom() == rect.y()));
 }
 
 std::ostream& operator<<(std::ostream& out, const gfx::Rect& r) {
   return out << r.origin() << " " << r.size();
 }
 
 }  // namespace gfx