[mac,win] Enable checking for 64-bit Pepper Flash

chrome/test/data/components/flapper/windows_x64/manifest.json

 {
     "description": "Pepper Flash Player",
     "name": "Flapper",
     "version": "11.9.900.170",
     "x-flapper-revision": "1232353",
     "x-ppapi-arch": "x64",
-    "x-ppapi-os": "linux",
+    "x-ppapi-os": "win",
     "x-ppapi-required-interfaces": [
         "PPB_AudioConfig;1.1|PPB_AudioConfig;1.0",
         "PPB_AudioInput(Dev);0.3|PPB_AudioInput(Dev);0.2",
         "PPB_Audio;1.0",
         "PPB_BrowserFont_Trusted;1.0",
         "PPB_Buffer(Dev);0.4",
         "PPB_CharSet(Dev);0.4",
         "PPB_Core;1.0",
         "PPB_Crypto(Dev);0.1",
         "PPB_CursorControl(Dev);0.4",
@@ skipping 23 matching lines @@
         "PPB_URLLoader;1.0",
         "PPB_URLLoaderTrusted;0.3",
         "PPB_URLRequestInfo;1.0",
         "PPB_URLResponseInfo;1.0",
         "PPB_URLUtil(Dev);0.6",
         "PPB_Var;1.1|PPB_Var;1.0",
         "PPB_VideoCapture(Dev);0.3|PPB_VideoCapture(Dev);0.2",
         "PPB_View;1.0"
     ]
 }