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

Source/core/dom/MainThreadTaskRunnerTest.cpp

Index: Source/core/dom/MainThreadTaskRunnerTest.cpp
diff --git a/Source/core/dom/MainThreadTaskRunnerTest.cpp b/Source/core/dom/MainThreadTaskRunnerTest.cpp
index 1d0b9a064784051e9a88c73edc923e5e904455bb..ee25ce82fecf6ccd1d14935c4563abc78f64e797 100644
--- a/Source/core/dom/MainThreadTaskRunnerTest.cpp
+++ b/Source/core/dom/MainThreadTaskRunnerTest.cpp
@@ -30,8 +30,10 @@
 
 #include "core/dom/ExecutionContext.h"
 #include "core/dom/ExecutionContextTask.h"
+#include "core/dom/SecurityContext.h"
 #include "core/events/EventQueue.h"
 #include "core/testing/UnitTestHelpers.h"
+#include "wtf/Forward.h"
 #include <gtest/gtest.h>
 
 using namespace WebCore;
@@ -47,7 +49,7 @@ public:
     virtual void close() OVERRIDE { }
 };
 
-class NullExecutionContext : public RefCountedWillBeGarbageCollectedFinalized<NullExecutionContext>, public ExecutionContext {
+class NullExecutionContext : public RefCountedWillBeGarbageCollectedFinalized<NullExecutionContext>, public SecurityContext, public ExecutionContext {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(NullExecutionContext);
 public:
     NullExecutionContext();
@@ -67,13 +69,23 @@ public:
     using RefCounted<NullExecutionContext>::ref;
     using RefCounted<NullExecutionContext>::deref;
 
+    virtual void reportBlockedScriptExecutionToInspector(const String& directiveText) OVERRIDE { }
+
+    virtual SecurityContext& securityContext() { return *this; }
+
     virtual void refExecutionContext() OVERRIDE { ref(); }
     virtual void derefExecutionContext() OVERRIDE { deref(); }
 #endif
 
+protected:
+    virtual const KURL& virtualURL() const OVERRIDE { return m_dummyURL; }
+    virtual KURL virtualCompleteURL(const String&) const OVERRIDE { return m_dummyURL; }
+
 private:
     bool m_tasksNeedSuspension;
     OwnPtrWillBeMember<EventQueue> m_queue;
+
+    KURL m_dummyURL;
 };
 
 NullExecutionContext::NullExecutionContext()