mac: Use convertSizeFromBacking: instead of the deprecated ...FromBase:

chrome/browser/ui/cocoa/nsview_additions.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/nsview_additions.h"
 
+#if !defined(MAC_OS_X_VERSION_10_7) || \
+    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_7
+
+@interface (LionAPI)
+- (NSSize)convertSizeFromBacking:(NSSize)size;
+@end
+
+#endif  // 10.7
+
 @implementation NSView (ChromeAdditions)
 
 - (CGFloat)cr_lineWidth {
-  // NOTE: This is a correct use of base coordinate system, to perform pixel
-  // alignment.
-  return [self convertSizeFromBase:NSMakeSize(1, 1)].width;
+  // All shipping retina macs run at least 10.7.

[Avi (use Gerrit), 2012/09/04 20:17:23]

therefore, that's the minimum system we support HiDPI on.

+  if (![self respondsToSelector:@selector(convertSizeFromBacking:)])
+    return 1;
+  return [self convertSizeFromBacking:NSMakeSize(1, 1)].width;
 }
 
 - (BOOL)cr_isMouseInView {
   NSPoint mouseLoc = [[self window] mouseLocationOutsideOfEventStream];
   mouseLoc = [[self superview] convertPoint:mouseLoc fromView:nil];
   return [self hitTest:mouseLoc] == self;
 }
 
 @end