Remove some unused functions in core

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 1733fd160fb48c1f340a4a8f8e08be743b793b49..90896499df5e3743190cd9b0a8ec5349220cb945 100644
--- a/Source/core/frame/csp/ContentSecurityPolicy.cpp
+++ b/Source/core/frame/csp/ContentSecurityPolicy.cpp
@@ -546,11 +546,6 @@ bool ContentSecurityPolicy::allowAncestors(LocalFrame* frame, const KURL& url, C
     return isAllowedByAllWithFrame<&CSPDirectiveList::allowAncestors>(m_policies, frame, url, reportingStatus);
 }
 
-bool ContentSecurityPolicy::allowChildContextFromSource(const KURL& url, ContentSecurityPolicy::ReportingStatus reportingStatus) const
-{
-    return isAllowedByAllWithURL<&CSPDirectiveList::allowChildContextFromSource>(m_policies, url, reportingStatus);
-}
-
 bool ContentSecurityPolicy::allowWorkerContextFromSource(const KURL& url, ContentSecurityPolicy::ReportingStatus reportingStatus) const
 {
     // CSP 1.1 moves workers from 'script-src' to the new 'child-src'. Measure the impact of this backwards-incompatible change.
@@ -583,22 +578,6 @@ ReflectedXSSDisposition ContentSecurityPolicy::reflectedXSSDisposition() const
     return disposition;
 }
 
-ReferrerPolicy ContentSecurityPolicy::referrerPolicy() const
-{
-    ReferrerPolicy referrerPolicy = ReferrerPolicyDefault;
-    bool first = true;
-    for (const auto& policy : m_policies) {
-        if (policy->didSetReferrerPolicy()) {
-            if (first)
-                referrerPolicy = policy->referrerPolicy();
-            else
-                referrerPolicy = mergeReferrerPolicies(referrerPolicy, policy->referrerPolicy());
-            first = false;
-        }
-    }
-    return referrerPolicy;
-}
-
 bool ContentSecurityPolicy::didSetReferrerPolicy() const
 {
     for (const auto& policy : m_policies) {