Mac: Fix window ordering for certificate viewer/selector sheets and overlays.

chrome/browser/ui/cocoa/ssl_client_certificate_selector_cocoa.mm

Index: chrome/browser/ui/cocoa/ssl_client_certificate_selector_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/ssl_client_certificate_selector_cocoa.mm b/chrome/browser/ui/cocoa/ssl_client_certificate_selector_cocoa.mm
index aa06b2d989ff696541645153fad4f79cd81ca48b..f9df99da2ec23aed0b8b0d5756bbf1e095a8af8e 100644
--- a/chrome/browser/ui/cocoa/ssl_client_certificate_selector_cocoa.mm
+++ b/chrome/browser/ui/cocoa/ssl_client_certificate_selector_cocoa.mm
@@ -286,6 +286,9 @@ void ClearTableViewDataSourcesIfNeeded(NSWindow*) {}
 
   oldResizesSubviews_ = [[sheetWindow contentView] autoresizesSubviews];
   [[sheetWindow contentView] setAutoresizesSubviews:NO];
+
+  // Ensure this overlay doesn't interfere with overlays with hidden sheets.
+  [overlayWindow_ setLevel:NSNormalWindowLevel];
 }
 
 - (void)unhideSheet {
@@ -293,6 +296,9 @@ void ClearTableViewDataSourcesIfNeeded(NSWindow*) {}
   [[sheetWindow contentView] setAutoresizesSubviews:oldResizesSubviews_];
   [sheetWindow setAlphaValue:1.0];
   [sheetWindow setIgnoresMouseEvents:NO];
+
+  // Set the current overlay's level higher than overlays with hidden sheets.
+  [overlayWindow_ setLevel:NSFloatingWindowLevel];
 }
 
 - (void)pulseSheet {