Replicate WebInsecureRequestPolicy instead of a bool for strict mixed content checks.

content/browser/DEPS

 include_rules = [
   # Allow inclusion of specific components that we depend on. We may only
   # depend on components which we share with the mojo html_viewer.
   "+components/filesystem",
   "+components/leveldb",
   "+components/link_header_util",
   "+components/mime_util",
   "+components/mus/public/interfaces",
   "+components/mus/public",
   "+components/network_session_configurator/switches.h",
@@ skipping 36 matching lines @@
   # No inclusion of WebKit from the browser, other than strictly enum/POD,
   # header-only types, and some selected common code.
   "-third_party/WebKit",
   "+third_party/WebKit/public/platform/WebAddressSpace.h",
   "+third_party/WebKit/public/platform/WebCursorInfo.h",
   "+third_party/WebKit/public/platform/WebDisplayMode.h",
   "+third_party/WebKit/public/platform/WebDragOperation.h",
   "+third_party/WebKit/public/platform/WebFocusType.h",
   "+third_party/WebKit/public/platform/WebGamepad.h",
   "+third_party/WebKit/public/platform/WebGamepads.h",
+  "+third_party/WebKit/public/platform/WebInsecureRequestPolicy.h",
   "+third_party/WebKit/public/platform/WebReferrerPolicy.h",
   "+third_party/WebKit/public/platform/WebScreenInfo.h",
   "+third_party/WebKit/public/platform/WebString.h",
   "+third_party/WebKit/public/platform/mime_registry.mojom.h",
   "+third_party/WebKit/public/platform/modules/background_sync/background_sync.mojom.h",
   "+third_party/WebKit/public/platform/modules/geolocation/geolocation.mojom.h",
   "+third_party/WebKit/public/platform/modules/imagecapture/image_capture.mojom.h",
   "+third_party/WebKit/public/platform/modules/indexeddb/WebIDBDatabaseException.h",
   "+third_party/WebKit/public/platform/modules/indexeddb/WebIDBTypes.h",
   "+third_party/WebKit/public/platform/modules/notifications/WebNotificationConstants.h",
@@ skipping 65 matching lines @@
     "+content/browser/power_save_blocker_impl.h",
     "+content/public/browser/power_save_blocker.h",
 
     # These dependencies need to be removed.
     "!content/browser/android/content_view_core_impl.h",
     "!content/browser/web_contents/web_contents_impl.h",
     "!content/public/browser/android/content_view_core.h",
     "!content/public/browser/web_contents_observer.h",
   ]
 }