Allow arbitrary sizes for extension icons (and bookmark app icons)

extensions/common/constants.h

Index: extensions/common/constants.h
diff --git a/extensions/common/constants.h b/extensions/common/constants.h
index 802289634ba6c080ca728c2603b4ad1cf091b80e..a59d33725ff044acaae4690097dd95f7afcdef23 100644
--- a/extensions/common/constants.h
+++ b/extensions/common/constants.h
@@ -190,10 +190,6 @@ enum ExtensionIcons {
   EXTENSION_ICON_INVALID = 0,
 };
 
-// List of sizes for extension icons that can be defined in the manifest.
-extern const int kExtensionIconSizes[];
-extern const size_t kNumExtensionIconSizes;
-
 // The extension id of the PDF extension.
 extern const char kPdfExtensionId[];