Improve scheme validation check in NavigatorContentUtils

Source/modules/navigatorcontentutils/NavigatorContentUtils.cpp

Index: Source/modules/navigatorcontentutils/NavigatorContentUtils.cpp
diff --git a/Source/modules/navigatorcontentutils/NavigatorContentUtils.cpp b/Source/modules/navigatorcontentutils/NavigatorContentUtils.cpp
index b0384923791a4bd42c6956d96f9ef662d7b9a0c8..b536c23b2e08a8e872464deefd1930c3d1b1d82c 100644
--- a/Source/modules/navigatorcontentutils/NavigatorContentUtils.cpp
+++ b/Source/modules/navigatorcontentutils/NavigatorContentUtils.cpp
@@ -113,6 +113,13 @@ static bool verifyProtocolHandlerScheme(const String& scheme, const String& meth
         return false;
     }
 
+    // The specification requires that schemes don't contain colons.
+    size_t index = scheme.find(':');
+    if (index != kNotFound) {
+        exceptionState.throwDOMException(SyntaxError, "The scheme '" + scheme + "' contains colon.");
+        return false;
+    }
+
     if (isProtocolWhitelisted(scheme))
         return true;
     exceptionState.throwSecurityError("The scheme '" + scheme + "' doesn't belong to the protocol whitelist. Please prefix non-whitelisted schemes with the string 'web+'.");