Clean up deterministic build whitelist slightly.

Remove a redundant entry, and add a dedicated bug line for
nacl_helper_bootstrap now that I understand what's going on there.

Bug: 918882
Change-Id: Id5c12c9096783dda98b9c80c4de0a9db860d1aa7
Reviewed-on: https://chromium-review.googlesource.com/c/1394707Reviewed-by: Erik Chen <erikchen@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619686}

tools/determinism/deterministic_build_whitelist.pyl

@@ -22,8 +22,10 @@
     # https://crbug.com/908463
     'fontconfig_caches/df1acc8c-39d5-4a8b-8507-b1a7396ac3ac-le64.cache-7',
 
-    # nacl stuff, https://crbug.com/429358
+    # https://crbug.com/918882
     'nacl_helper_bootstrap',
+
+    # nacl stuff, https://crbug.com/429358
     'nacl_helper_nonsfi',
     'nacl_helper_nonsfi_unittests_main',
     'nacl_test_data/nonsfi/irt_exception_test_pnacl_newlib_x32_nonsfi.nexe',
@@ -36,9 +38,6 @@
   'linux_component': [
     # https://crbug.com/900696
     'remoting-webapp.v2.zip',
-
-    # additional nacl stuff, https://crbug.com/429358
-    'nacl_helper_bootstrap',
   ],
 
   # https://crbug.com/330262