Fix window shadows.

chrome/browser/ui/cocoa/browser_window_controller.mm

Index: chrome/browser/ui/cocoa/browser_window_controller.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_controller.mm b/chrome/browser/ui/cocoa/browser_window_controller.mm
index 89a1b9eec4fdcd5406a7d69ebc598a9fb85159b4..ec6fd54e6135e2637e58c7f72f51cdf95bfa0d0e 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller.mm
+++ b/chrome/browser/ui/cocoa/browser_window_controller.mm
@@ -233,9 +233,12 @@ enum {
     // be big enough to hold all locks that'll ever be needed.
     barVisibilityLocks_.reset([[NSMutableSet setWithCapacity:10] retain]);
 
-    // Sets the window to not have rounded corners, which prevents
-    // the resize control from being inset slightly and looking ugly.
-    if ([window respondsToSelector:@selector(setBottomCornerRounded:)])
+    // Set the window to not have rounded corners, which prevents the resize
+    // control from being inset slightly and looking ugly. Only bother to do
+    // this on Snow Leopard and earlier; on Lion and later all windows have
+    // rounded bottom corners, and this won't work anyway.
+    if (base::mac::IsOSSnowLeopardOrEarlier() &&
+        [window respondsToSelector:@selector(setBottomCornerRounded:)])
       [window setBottomCornerRounded:NO];
 
     // Lion will attempt to automagically save and restore the UI. This