Move NTDDI_VERSION define to common.gypi.

This centralizes this definition and removes it from the various places it is currently replicated. This also allows external projects that rely on Chromium base to compile successfully, as otherwise this (required) definition is missing.

BUG=


Review URL: https://chromiumcodereview.appspot.com/11190060

git-svn-id: http://src.chromium.org/svn/trunk/src/build@163299 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -1705,6 +1705,9 @@
           '__STD_C',
           '_CRT_SECURE_NO_DEPRECATE',
           '_SCL_SECURE_NO_DEPRECATE',
+          # This define is required to pull in the new Win8 interfaces from
+          # system headers like ShObjIdl.h.
+          'NTDDI_VERSION=0x06020000',
         ],
         'include_dirs': [
           '<(DEPTH)/third_party/wtl/include',