Fix incorrect use of UnrefCustomCursor.

ui/base/cursor/cursor_x11.cc

Index: ui/base/cursor/cursor_x11.cc
diff --git a/ui/base/cursor/cursor_x11.cc b/ui/base/cursor/cursor_x11.cc
index b74d03c338d3ed8b4660be18377ec027e9f89824..edf6c9bb6ba8cf7dc2403e9d9d2faa1481b5286b 100644
--- a/ui/base/cursor/cursor_x11.cc
+++ b/ui/base/cursor/cursor_x11.cc
@@ -9,11 +9,13 @@
 namespace ui {
 
 void Cursor::RefCustomCursor() {
-  ui::RefCustomXCursor(platform_cursor_);
+  if (platform_cursor_)
+    ui::RefCustomXCursor(platform_cursor_);

[sadrul, 2012/09/12 19:46:56]

Do you know where Ref/Unref is getting called but platform_cursor_ is null?

[mazda, 2012/09/12 19:56:43]

That's the following lines in webkit/glue/webcursor_aura.cc (line 102).

ui::Cursor cursor(ui::kCursorCustom);
cursor.SetPlatformCursor(GetPlatformCursor());

 }
 
 void Cursor::UnrefCustomCursor() {
-  ui::UnrefCustomXCursor(platform_cursor_);
+  if (platform_cursor_)
+    ui::UnrefCustomXCursor(platform_cursor_);
 }
 
 }  // namespace ui