exhibit 1: explicit null checks

ui/gfx/image/image.h

Index: ui/gfx/image/image.h
diff --git a/ui/gfx/image/image.h b/ui/gfx/image/image.h
index 079014803a850d21a83672d73d4ddc300ea79843..7254bd047003daef265ed6845da3d81f9efec931 100644
--- a/ui/gfx/image/image.h
+++ b/ui/gfx/image/image.h
@@ -115,18 +115,6 @@ class UI_EXPORT Image {
   NSImage* ToNSImage() const;
 #endif
 
-  // Same as ToSkBitmap(), but returns a null SkBitmap if this image is empty.
-  SkBitmap AsBitmap() const;
-
-  // Same as ToImageSkia(), but returns an empty ImageSkia if this
-  // image is empty.
-  ImageSkia AsImageSkia() const;
-
-#if defined(OS_MACOSX)
-  // Same as ToSkBitmap(), but returns nil if this image is empty.
-  NSImage* AsNSImage() const;
-#endif
-
   // Performs a conversion, like above, but returns a copy of the result rather
   // than a weak pointer. The caller is responsible for deleting the result.
   // Note that the result is only a copy in terms of memory management; the