Add metrics for 'upgrade-insecure-requests'.

Source/core/frame/csp/ContentSecurityPolicy.cpp

Index: Source/core/frame/csp/ContentSecurityPolicy.cpp
diff --git a/Source/core/frame/csp/ContentSecurityPolicy.cpp b/Source/core/frame/csp/ContentSecurityPolicy.cpp
index 1ffcf34c76bb03dc0f9a1dffff2e33fe44cc8677..52ac542b69528977fb643f0630a73c5765be071c 100644
--- a/Source/core/frame/csp/ContentSecurityPolicy.cpp
+++ b/Source/core/frame/csp/ContentSecurityPolicy.cpp
@@ -177,7 +177,8 @@ void ContentSecurityPolicy::applyPolicySideEffectsToExecutionContext()
             document->enforceStrictMixedContentChecking();
         if (didSetReferrerPolicy())
             document->setReferrerPolicy(m_referrerPolicy);
-        if (m_insecureRequestsPolicy > document->insecureRequestsPolicy()) {
+        if (m_insecureRequestsPolicy == SecurityContext::InsecureRequestsUpgrade) {
+            UseCounter::count(document, UseCounter::UpgradeInsecureRequestsEnabled);
             document->setInsecureRequestsPolicy(m_insecureRequestsPolicy);
             if (!securityOrigin()->host().isNull())
                 document->addInsecureNavigationUpgrade(securityOrigin()->host().impl()->hash());