Whitelist more QuickOffice extensions to use the mimeHandler private API.

This matches the permissions used by the old mime_types API that the new API replaces.

Bug: 819761
Change-Id: I7b9cb7150762d54a375bf1fa69cd10d4b715dfb0
Reviewed-on: https://chromium-review.googlesource.com/1007636Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550406}

extensions/common/api/_manifest_features.json

@@ -225,6 +225,8 @@
     "whitelist": [
       "787000072C6FBB934AF5A42275CDE73FC977D995",  // browser_tests
       "2FC374607C2DF285634B67C64A2E356C607091C3",  // QuickOffice
+      "12E618C3C6E97495AAECF2AC12DEB082353241C6",  // QuickOffice component extension
+      "3727DD3E564B6055387425027AD74C58784ACC15",  // QuickOffice Editor
       "CBCC42ABED43A4B58FE3810E62AFFA010EB0349F"   // PDF
     ]
   },