Use the official zlib repository rather than Chromium's mirror

Historically OSS Mozc has checked out a patched version of zlib from Chromium's repository.  However, OSS Mozc doesn't rely on those local patches in practice.  Thus we will check out zlib from Mark Adler's GitHub repository.
No user-visible behavior change is intended.

BUG=none
TEST=unittest

git-svn-id: https://mozc.googlecode.com/svn/trunk@565 a6090854-d499-a067-5803-1114d4e51264
diff --git a/src/DEPS b/src/DEPS
index 309940b..b8bbbbb 100644
--- a/src/DEPS
+++ b/src/DEPS
@@ -38,7 +38,7 @@
   "wtl_revision": "587",
   "zinnia_revision": "16",
   "jsr305_version": "2.0.2",
-  "zlib_revision": "198222",
+  "zlib_revision": "50893291621658f355bc5b4d450a8d06a563053d",
   "japanese_usage_dictionary_revision": "10",
 }
 
@@ -87,7 +87,6 @@
       "https://github.com/googlei18n/fonttools.git@" +
       Var("fonttools_revision"),
     "src/third_party/zlib/v1_2_8":
-      "https://src.chromium.org/chrome/trunk/src/third_party/zlib@" +
-      Var("zlib_revision"),
+      "https://github.com/madler/zlib.git@" + Var("zlib_revision"),
   },
 }
diff --git a/src/mozc_version_template.txt b/src/mozc_version_template.txt
index a307026..6b58b3b 100644
--- a/src/mozc_version_template.txt
+++ b/src/mozc_version_template.txt
@@ -1,6 +1,6 @@
 MAJOR=2
 MINOR=17
-BUILD=2074
+BUILD=2075
 REVISION=102
 # NACL_DICTIONARY_VERSION is the target version of the system dictionary to be
 # downloaded by NaCl Mozc.
diff --git a/src/protobuf/protobuf.gyp b/src/protobuf/protobuf.gyp
index 1c5b8b2..d1e5c55 100644
--- a/src/protobuf/protobuf.gyp
+++ b/src/protobuf/protobuf.gyp
@@ -300,10 +300,8 @@
             ],
           },
           'cflags': [
-            '-Wno-error=uninitialized',
             '-Wno-implicit-function-declaration',
-            '-Wno-uninitialized',
-            '-Wno-unused-value',
+            '-Wno-incompatible-pointer-types-discards-qualifiers',
           ],
           'configurations': {
             'Debug_Base': {