mac: Move more 10.7 api stuff into sdk_forward_declarations.h

media/video/capture/screen/mac/desktop_configuration.mm

 // Copyright (c) 2013 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 "media/video/capture/screen/mac/desktop_configuration.h"
 
 #include <math.h>
 #include <algorithm>
 #include <Cocoa/Cocoa.h>
 
 #include "base/logging.h"
-
-#if !defined(MAC_OS_X_VERSION_10_7) || \
-    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_7
-
-@interface NSScreen (LionAPI)
-- (CGFloat)backingScaleFactor;
-- (NSRect)convertRectToBacking:(NSRect)aRect;
-@end
-
-#endif  // 10.7
+#include "base/mac/sdk_forward_declarations.h"
 
 namespace media {
 
 namespace {
 
 webrtc::DesktopRect NSRectToDesktopRect(const NSRect& ns_rect) {
   return webrtc::DesktopRect::MakeLTRB(
     static_cast<int>(floor(ns_rect.origin.x)),
     static_cast<int>(floor(ns_rect.origin.y)),
     static_cast<int>(ceil(ns_rect.origin.x + ns_rect.size.width)),
@@ skipping 29 matching lines @@
 
   // Determine the display's logical & physical dimensions.
   NSRect ns_bounds = [screen frame];
   display_config.bounds = NSRectToDesktopRect(ns_bounds);
 
   // If the host is running Mac OS X 10.7+ or later, query the scaling factor
   // between logical and physical (aka "backing") pixels, otherwise assume 1:1.
   if ([screen respondsToSelector:@selector(backingScaleFactor)] &&
       [screen respondsToSelector:@selector(convertRectToBacking:)]) {
     display_config.dip_to_pixel_scale = [screen backingScaleFactor];
-    NSRect ns_pixel_bounds = [screen convertRectToBacking: ns_bounds];
+    NSRect ns_pixel_bounds = [screen convertRectToBacking:ns_bounds];
     display_config.pixel_bounds = NSRectToDesktopRect(ns_pixel_bounds);
   } else {
     display_config.pixel_bounds = display_config.bounds;
   }
 
   return display_config;
 }
 
 } // namespace
 
@@ skipping 49 matching lines @@
     desktop_config.bounds =
         JoinRects(desktop_config.bounds, display_config.bounds);
     desktop_config.pixel_bounds =
         JoinRects(desktop_config.pixel_bounds, display_config.pixel_bounds);
   }
 
   return desktop_config;
 }
 
 }  // namespace media