Replace ContentSecurityPolicy::client() with a method returning an ExecutionContext

Source/core/dom/ExecutionContext.cpp

Index: Source/core/dom/ExecutionContext.cpp
diff --git a/Source/core/dom/ExecutionContext.cpp b/Source/core/dom/ExecutionContext.cpp
index 66f959be67681166437f2a512776afc29bd1c10b..ed8ee097c7ce7115861750ded98f03aab581ec75 100644
--- a/Source/core/dom/ExecutionContext.cpp
+++ b/Source/core/dom/ExecutionContext.cpp
@@ -254,7 +254,7 @@ const KURL& ExecutionContext::url() const
         return emptyURL;
     }
 
-    return m_client->virtualURL();
+    return virtualURL();
 }
 
 KURL ExecutionContext::completeURL(const String& url) const
@@ -265,7 +265,7 @@ KURL ExecutionContext::completeURL(const String& url) const
         return emptyURL;
     }
 
-    return m_client->virtualCompleteURL(url);
+    return virtualCompleteURL(url);
 }
 
 void ExecutionContext::disableEval(const String& errorMessage)