Putting the findbar into a child window.

chrome/browser/cocoa/find_bar_cocoa_controller.h

Index: chrome/browser/cocoa/find_bar_cocoa_controller.h
===================================================================
--- chrome/browser/cocoa/find_bar_cocoa_controller.h	(revision 52179)
+++ chrome/browser/cocoa/find_bar_cocoa_controller.h	(working copy)
@@ -40,6 +40,10 @@
   // window is removed).
   scoped_nsobject<NSViewAnimation> currentAnimation_;
 
+  // The borderless window that contains this findbar.  This window will be
+  // added as a child window of the browser window.
+  scoped_nsobject<NSWindow> window_;
+
   // If YES, do nothing as a result of find pasteboard update notifications.
   BOOL suppressPboardUpdateActions_;
 };
@@ -47,6 +51,8 @@
 // Initializes a new FindBarCocoaController.
 - (id)init;
 
+- (NSWindow*)window;
+
 - (void)setFindBarBridge:(FindBarBridge*)findBar;
 
 - (IBAction)close:(id)sender;