Bug 1310307 - Disable HSTS priming in some mixed content tests where it causes a bogus request, a=testonly

MozReview-Commit-ID: 7wWbT7Ly7z

testing/web-platform/meta/mixed-content/blockable/no-opt-in/cross-origin-http/picture-tag/top-level/no-redirect/no-opt-in-blocks.https.html.ini

@@ -0,0 +1 @@
+prefs: [security.mixed_content.send_hsts_priming:false, security.mixed_content.use_hsts:false]

testing/web-platform/meta/mixed-content/optionally-blockable/no-opt-in/cross-origin-http/link-prefetch-tag/top-level/keep-scheme-redirect/no-opt-in-allows.https.html.ini

@@ -1,5 +1,6 @@
 [no-opt-in-allows.https.html]
   type: testharness
+  prefs: [security.mixed_content.send_hsts_priming:false, security.mixed_content.use_hsts:false]
   [opt_in_method: no-opt-in\n                                 origin: cross-origin-http\n                                 source_scheme: https\n                                 context_nesting: top-level\n                                 redirection: keep-scheme-redirect\n                                 subresource: link-prefetch-tag\n                                 expectation: allowed]
     expected: FAIL
     bug: haven't implement prefetch link as an optionally blockable item