Renamed `embedding-csp` HTTP request header to `required-csp`.

third_party/WebKit/Source/core/loader/DocumentLoader.cpp

Index: third_party/WebKit/Source/core/loader/DocumentLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/DocumentLoader.cpp b/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
index d54daaaf746fbd5a2a6a3fed6f48fa6960c3e6ca..a90e72fb90291bb6d1e11b16d19203c69ecfa7de 100644
--- a/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
@@ -586,12 +586,12 @@ void DocumentLoader::ResponseReceived(
           kContentSecurityPolicyHeaderTypeEnforce,
           kContentSecurityPolicyHeaderSourceHTTP);
     } else {
-      ContentSecurityPolicy* embedding_csp = ContentSecurityPolicy::Create();
-      embedding_csp->AddPolicyFromHeaderValue(
+      ContentSecurityPolicy* required_csp = ContentSecurityPolicy::Create();
+      required_csp->AddPolicyFromHeaderValue(
           GetFrameLoader().RequiredCSP(),
           kContentSecurityPolicyHeaderTypeEnforce,
           kContentSecurityPolicyHeaderSourceHTTP);
-      if (!embedding_csp->Subsumes(*content_security_policy_)) {
+      if (!required_csp->Subsumes(*content_security_policy_)) {
         String message = "Refused to display '" +
                          response.Url().ElidedString() +
                          "' because it has not opted-into the following policy "