Fix findbar z-ordering issue in fullscreen mode.

BUG=74065
TEST=Launch chromium and trigger an infobar.  Enter presentation mode, then Cmd-F to trigger find in page.  Findbar should be visible even when the overlay is open.
TEST=Launch chromium and trigger an infobar.  Enter fullscreen, ensure that presentation mode is off (the UI is always visible), then Cmd-F to trigger find in page.  Findbar should be visible even when the overlay is open.

Review URL: http://codereview.chromium.org/7491095

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@95948 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/ui/cocoa/browser_window_controller.mm

@@ -1436,10 +1436,13 @@ enum {
 
   // Create a controller for the findbar.
   findBarCocoaController_.reset([findBarCocoaController retain]);
-  NSView *contentView = [[self window] contentView];
+  NSView* contentView = [[self window] contentView];
+  NSView* relativeView =
+      [self inPresentationMode] ? [toolbarController_ view] :
+                                  [infoBarContainerController_ view];
   [contentView addSubview:[findBarCocoaController_ view]
                positioned:NSWindowAbove
-               relativeTo:[infoBarContainerController_ view]];
+               relativeTo:relativeView];
 
   // Place the find bar immediately below the toolbar/attached bookmark bar. In
   // presentation mode, it hangs off the top of the screen when the bar is