diff --git a/pkgs/applications/networking/browsers/chromium/default.nix b/pkgs/applications/networking/browsers/chromium/default.nix
index 59b05e94911f..7dee8f3d296c 100644
--- a/pkgs/applications/networking/browsers/chromium/default.nix
+++ b/pkgs/applications/networking/browsers/chromium/default.nix
@@ -63,13 +63,13 @@ let
     use_system_stlport = true;
     use_system_xdg_utils = true;
     use_system_yasm = true;
-    use_system_zlib = true;
+    use_system_zlib = false; # http://crbug.com/143623
 
     use_system_harfbuzz = false;
     use_system_icu = false;
-    use_system_libwebp = false; # See chromium issue #133161
+    use_system_libwebp = false; # http://crbug.com/133161
     use_system_skia = false;
-    use_system_sqlite = false; # See chromium issue #22208
+    use_system_sqlite = false; # http://crbug.com/22208
     use_system_v8 = false;
   };
 
@@ -84,18 +84,6 @@ let
     pre22 = versionOlder sourceInfo.version "22.0.0.0";
   in if pre22 then ./enable_seccomp.patch else ./enable_seccomp22.patch;
 
-  # XXX: this reverts r151720 to prevent http://crbug.com/143623
-  maybeRevertZlibChanges = let
-    below22_91 = versionOlder sourceInfo.version "22.0.1229.91";
-    patch = fetchurl {
-      name = "revert-r151720";
-      url = "http://git.chromium.org/gitweb/?p=chromium.git;a=commitdiff_plain;"
-          + "hp=4419ec6414b33b6b19bb2e380b4998ed5193ecab;"
-          + "h=0fabb4fda7059a8757422e8a44e70deeab28e698";
-      sha256 = "0n0d6mkg89g8q63cifapzpg9dxfs2n6xvk4k13szhymvf67b77pf";
-    };
-  in optional (below22_91) patch;
-
 in stdenv.mkDerivation rec {
   name = "${packageName}-${version}";
   packageName = "chromium";
@@ -129,8 +117,7 @@ in stdenv.mkDerivation rec {
 
   patches = optional (!cfg.selinux) seccompPatch
          ++ optional cfg.cups ./cups_allow_deprecated.patch
-         ++ optional cfg.pulseaudio ./pulseaudio_array_bounds.patch
-         ++ maybeRevertZlibChanges;
+         ++ optional cfg.pulseaudio ./pulseaudio_array_bounds.patch;
 
   postPatch = optionalString cfg.openssl ''
     cat $opensslPatches | patch -p1 -d third_party/openssl/openssl