Index: render_widget_host_view_mac.mm
===================================================================
--- render_widget_host_view_mac.mm	(revision 212850)
+++ render_widget_host_view_mac.mm	(working copy)
@@ -2097,13 +2097,20 @@
 
   NSNotificationCenter* notificationCenter =
       [NSNotificationCenter defaultCenter];
+
+  // Backing property notifications crash on 10.6 when building with the 10.7
+  // SDK, see http://crbug.com/260595.
+  BOOL supportsBackingPropertiesNotification = base::mac::IsOSLionOrLater();
+
   if (oldWindow) {
+    if (supportsBackingPropertiesNotification) {
+      [notificationCenter
+          removeObserver:self
+                    name:NSWindowDidChangeBackingPropertiesNotification
+                  object:oldWindow];
+    }
     [notificationCenter
         removeObserver:self
-                  name:NSWindowDidChangeBackingPropertiesNotification
-                object:oldWindow];
-    [notificationCenter
-        removeObserver:self
                   name:NSWindowDidMoveNotification
                 object:oldWindow];
     [notificationCenter
@@ -2112,13 +2119,15 @@
                 object:oldWindow];
   }
   if (newWindow) {
+    if (supportsBackingPropertiesNotification) {
+      [notificationCenter
+          addObserver:self
+             selector:@selector(windowDidChangeBackingProperties:)
+                 name:NSWindowDidChangeBackingPropertiesNotification
+               object:newWindow];
+    }
     [notificationCenter
         addObserver:self
-           selector:@selector(windowDidChangeBackingProperties:)
-               name:NSWindowDidChangeBackingPropertiesNotification
-             object:newWindow];
-    [notificationCenter
-        addObserver:self
            selector:@selector(windowChangedGlobalFrame:)
                name:NSWindowDidMoveNotification
              object:newWindow];