exhibit 1: explicit null checks

chrome/browser/ui/cocoa/tab_contents/favicon_util_mac.mm

Index: chrome/browser/ui/cocoa/tab_contents/favicon_util_mac.mm
diff --git a/chrome/browser/ui/cocoa/tab_contents/favicon_util_mac.mm b/chrome/browser/ui/cocoa/tab_contents/favicon_util_mac.mm
index 9cc016e4d7e6c39d1e678ed6b239a441664a0754..bf29af034c34290dcdc962f33d1a6c30419ec8db 100644
--- a/chrome/browser/ui/cocoa/tab_contents/favicon_util_mac.mm
+++ b/chrome/browser/ui/cocoa/tab_contents/favicon_util_mac.mm
@@ -13,14 +13,12 @@ namespace mac {
 
 NSImage* FaviconForTabContents(TabContents* contents) {
   if (contents && contents->favicon_tab_helper()->FaviconIsValid()) {
-    NSImage* image = contents->favicon_tab_helper()->GetFavicon().AsNSImage();
-    // The |image| could be nil if the bitmap is null. In that case, fallback
-    // to the default image.
-    if (image) {
-      return image;
-    }
+    const gfx::Image& icon = contents->favicon_tab_helper()->GetFavicon();
+    if (!icon.IsEmpty())
+      return icon.ToNSImage();;
   }
 
+  // Fall back to the default image.
   ResourceBundle& rb = ResourceBundle::GetSharedInstance();
   return rb.GetNativeImageNamed(IDR_DEFAULT_FAVICON);
 }