mac: Use NSWidth() and friends in a few more places.

chrome/browser/ui/cocoa/browser_window_cocoa.mm

Index: chrome/browser/ui/cocoa/browser_window_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_cocoa.mm b/chrome/browser/ui/cocoa/browser_window_cocoa.mm
index 9f75da34ab49ac6d57178845024f1ea10f20e232..55451384ac63f484df19f59a596721d8ab5c5c00 100644
--- a/chrome/browser/ui/cocoa/browser_window_cocoa.mm
+++ b/chrome/browser/ui/cocoa/browser_window_cocoa.mm
@@ -146,7 +146,7 @@ void BrowserWindowCocoa::SetBounds(const gfx::Rect& bounds) {
   // Flip coordinates based on the primary screen.
   NSScreen* screen = [[NSScreen screens] objectAtIndex:0];
   cocoa_bounds.origin.y =
-      [screen frame].size.height - real_bounds.height() - real_bounds.y();
+      NSHeight([screen frame]) - real_bounds.height() - real_bounds.y();
 
   [window() setFrame:cocoa_bounds display:YES];
 }
@@ -268,8 +268,8 @@ gfx::Rect BrowserWindowCocoa::GetRestoredBounds() const {
   // Flip coordinates based on the primary screen.
   NSScreen* screen = [[NSScreen screens] objectAtIndex:0];
   NSRect frame = [controller_ regularWindowFrame];
-  gfx::Rect bounds(frame.origin.x, 0, frame.size.width, frame.size.height);
-  bounds.set_y([screen frame].size.height - frame.origin.y - frame.size.height);
+  gfx::Rect bounds(frame.origin.x, 0, NSWidth(frame), NSHeight(frame));
+  bounds.set_y(NSHeight([screen frame]) - NSMaxY(frame));
   return bounds;
 }