Convert 64-bit error for pe_image to #pragma message

I need this to make base compile on Win64. I'll follow-up with fixes in crbug.com/167707

Review URL: https://chromiumcodereview.appspot.com/11684007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@175089 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed