Don't count or report WCv0 usage for chrome:// URLs

Prior to this CL, the chrome://settings and other WebUI pages
would report deprecation messages in the Console, such as:

[Deprecation] HTML Imports is deprecated and will be removed in M80, around
February 2020. Please use ES modules instead. See
https://www.chromestatus.com/features/5144752345317376 and
https://developers.google.com/web/updates/2019/07/web-components-time-to-upgrade
for more details.

These will no longer be shown. Additionally, this usage of the
deprecated APIs will also no longer be counted.

Fixed: 1057337
Bug: 965770
Change-Id: Ibef14072bda8b4ad1147593d587d4fd941669ddb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2081236
Commit-Queue: Mason Freed <masonfreed@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Auto-Submit: Mason Freed <masonfreed@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746108}

third_party/blink/renderer/core/dom/document.cc

@@ -5798,7 +5798,7 @@ String Document::cookie(ExceptionState& exception_state) const {
     if (IsSandboxed(mojom::blink::WebSandboxFlags::kOrigin))
       exception_state.ThrowSecurityError(
           "The document is sandboxed and lacks the 'allow-same-origin' flag.");
-    else if (Url().ProtocolIs("data"))
+    else if (Url().ProtocolIsData())
       exception_state.ThrowSecurityError(
           "Cookies are disabled inside 'data:' URLs.");
     else
@@ -5824,7 +5824,7 @@ void Document::setCookie(const String& value, ExceptionState& exception_state) {
     if (IsSandboxed(mojom::blink::WebSandboxFlags::kOrigin))
       exception_state.ThrowSecurityError(
           "The document is sandboxed and lacks the 'allow-same-origin' flag.");
-    else if (Url().ProtocolIs("data"))
+    else if (Url().ProtocolIsData())
       exception_state.ThrowSecurityError(
           "Cookies are disabled inside 'data:' URLs.");
     else
@@ -8665,6 +8665,15 @@ void Document::CountDeprecation(mojom::WebFeature feature) {
       CountUse(WebFeature::kDocumentRegisterElementOnReverseOriginTrials);
     }
   }
+
+  // Don't count or report usage of WebComponentsV0 for chrome:// URLs.
+  if (Url().ProtocolIs("chrome") &&
+      (feature == WebFeature::kHTMLImports ||
+       feature == WebFeature::kElementCreateShadowRoot ||
+       feature == WebFeature::kDocumentRegisterElement)) {
+    return;
+  }
+
   Deprecation::CountDeprecation(Loader(), feature);
 }