Update sync protos to use the new shared protoc gyp rules

Just a refactoring.

Review URL: http://codereview.chromium.org/7677034

git-svn-id: http://src.chromium.org/svn/trunk/src/build@97484 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

protoc.gypi

@@ -81,6 +81,11 @@
       '<(SHARED_INTERMEDIATE_DIR)/protoc_out',
     ]
   },
+  'export_dependent_settings': [
+    # The generated headers reference headers within protobuf_lite,
+    # so dependencies must be able to find those headers too.
+    '<(DEPTH)/third_party/protobuf/protobuf.gyp:protobuf_lite',
+  ],
   # This target exports a hard dependency because it generates header
   # files.
   'hard_dependency': 1,