[Presentation API / Media Router] Relax PresentationRequest URL check.

third_party/WebKit/Source/modules/presentation/PresentationRequest.cpp

Index: third_party/WebKit/Source/modules/presentation/PresentationRequest.cpp
diff --git a/third_party/WebKit/Source/modules/presentation/PresentationRequest.cpp b/third_party/WebKit/Source/modules/presentation/PresentationRequest.cpp
index 155bee0c4904f6bb1c6fb5294c3baa1516a4dae5..50eddd6157a04c3db10f18ef73cb56567edc8594 100644
--- a/third_party/WebKit/Source/modules/presentation/PresentationRequest.cpp
+++ b/third_party/WebKit/Source/modules/presentation/PresentationRequest.cpp
@@ -84,14 +84,14 @@ PresentationRequest* PresentationRequest::Create(
   for (size_t i = 0; i < urls.size(); ++i) {
     const KURL& parsed_url = KURL(execution_context->Url(), urls[i]);
 
-    if (!parsed_url.IsValid() || !(parsed_url.ProtocolIsInHTTPFamily() ||
-                                   parsed_url.ProtocolIs("cast"))) {
+    if (!parsed_url.IsValid()) {
       exception_state.ThrowDOMException(
           kSyntaxError, "'" + urls[i] + "' can't be resolved to a valid URL.");
       return nullptr;
     }
 
-    if (MixedContentChecker::IsMixedContent(
+    if (parsed_url.ProtocolIsInHTTPFamily() &&
+        MixedContentChecker::IsMixedContent(
             execution_context->GetSecurityOrigin(), parsed_url)) {
       exception_state.ThrowSecurityError(
           "Presentation of an insecure document [" + urls[i] +