WebKit-side: Implement StorageArea::containsItem(...) for the chromium port too. Cleanup some depre…

Platform/chromium/public/WebStorageArea.h

Index: Platform/chromium/public/WebStorageArea.h
===================================================================
--- Platform/chromium/public/WebStorageArea.h	(revision 119965)
+++ Platform/chromium/public/WebStorageArea.h	(working copy)
@@ -59,35 +59,20 @@
     // no entry for that key.
     virtual WebString getItem(const WebString& key) = 0;
 
+    // Returns |true| if the the area contains a value that corresponds to |key|.
+    virtual bool containsItem(const WebString& key) { return !getItem(key).isNull(); }
+
     // Set the value that corresponds to a specific key. Result will either be ResultOK
     // or some particular error. The value is NOT set when there's an error. |pageUrl| is the
     // url that should be used if a storage event fires.
-    virtual void setItem(const WebString& key, const WebString& newValue, const WebURL& pageUrl, Result& result)
-    {
-        WebString unused;
-        setItem(key, newValue, pageUrl, result, unused);
-    }
+    virtual void setItem(const WebString& key, const WebString& newValue, const WebURL& pageUrl, Result& result) { }
 
-
     // Remove the value associated with a particular key. |pageUrl| is the url that should be used
     // if a storage event fires.
-    virtual void removeItem(const WebString& key, const WebURL& pageUrl)
-    {
-        WebString unused;
-        removeItem(key, pageUrl, unused);
-    }
+    virtual void removeItem(const WebString& key, const WebURL& pageUrl) { }
 
     // Clear all key/value pairs. |pageUrl| is the url that should be used if a storage event fires.
-    virtual void clear(const WebURL& pageUrl)
-    {
-        bool unused;
-        clear(pageUrl, unused);
-    }
-
-    // DEPRECATED - being replaced by the async variants above which do not return oldValues or block until completion.
-    virtual void setItem(const WebString& key, const WebString& newValue, const WebURL&, Result&, WebString& oldValue) { }
-    virtual void removeItem(const WebString& key, const WebURL& pageUrl, WebString& oldValue)  { }
-    virtual void clear(const WebURL& pageUrl, bool& somethingCleared)  { }
+    virtual void clear(const WebURL& pageUrl) { }
 };
 
 } // namespace WebKit