Make ExecutionContext::setClient() protected

It's called only by its subclasses.

BUG=none
R=haraken

Review URL: https://codereview.chromium.org/324003003

git-svn-id: svn://svn.chromium.org/blink/trunk@175863 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/dom/ExecutionContext.h

@@ -70,7 +70,6 @@ public:
     virtual ~ExecutionContext();
 
     // Delegating to ExecutionContextClient
-    void setClient(ExecutionContextClient* client) { m_client = client; }
     bool isDocument() const { return m_client && m_client->isDocument(); }
     bool isWorkerGlobalScope() const { return m_client && m_client->isWorkerGlobalScope(); }
     bool isJSExecutionForbidden() { return m_client && m_client->isJSExecutionForbidden(); }
@@ -130,6 +129,7 @@ public:
     virtual EventQueue* eventQueue() const = 0;
 
 protected:
+    void setClient(ExecutionContextClient* client) { m_client = client; }
 
     ContextLifecycleNotifier& lifecycleNotifier();