Set 'chromium_code' to true in gyp files to get more compiler warnings (when building the nacl plugin in chrome).
Set 'chromium_code' to true in gyp files to get more compiler warnings (when building the nacl plugin in chrome).

If it is 0, we are treated as third party code with sloppier warning levels and chromium/src/build/common.gypi will filter out things like -Werror.
Review URL: https://chromiumcodereview.appspot.com/9442029

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@7881 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client