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 af3355d8adcde752790b0a749a8b7a637d3448bf..35abf8d55e16d3f5fa9d0945846353a305f60c72 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:
     void trace(Visitor* visitor) { ExecutionContext::trace(visitor); }
@@ -55,6 +57,10 @@ 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
@@ -65,9 +71,15 @@ public:
 
     NullExecutionContext();
 
+protected:
+    virtual const KURL& virtualURL() const OVERRIDE { return m_dummyURL; }
+    virtual KURL virtualCompleteURL(const String&) const OVERRIDE { return m_dummyURL; }
+
 private:
     bool m_tasksNeedSuspension;
     OwnPtr<EventQueue> m_queue;
+
+    KURL m_dummyURL;
 };
 
 NullExecutionContext::NullExecutionContext()