Fix "Get more extensions" link in about:extensions.

chrome/common/extensions/extension_constants.cc

Index: chrome/common/extensions/extension_constants.cc
diff --git a/chrome/common/extensions/extension_constants.cc b/chrome/common/extensions/extension_constants.cc
index 599769b0f772c93ef4794ba3a6508dd98b7ce0e3..48baffe81391e77312a0b3eaea930ed3f10dcc24 100644
--- a/chrome/common/extensions/extension_constants.cc
+++ b/chrome/common/extensions/extension_constants.cc
@@ -24,6 +24,10 @@ std::string GetWebstoreLaunchURL() {
   return gallery_prefix;
 }
 
+std::string GetExtensionGalleryURL() {
+  return GetWebstoreLaunchURL() + "/category/extensions";
+}
+
 std::string GetWebstoreItemDetailURLPrefix() {
   return GetWebstoreLaunchURL() + "/detail/";
 }