Remove unused blink::WebStorageArea::memoryBytesUsedByCache().

third_party/WebKit/Source/modules/storage/StorageArea.cpp

Index: third_party/WebKit/Source/modules/storage/StorageArea.cpp
diff --git a/third_party/WebKit/Source/modules/storage/StorageArea.cpp b/third_party/WebKit/Source/modules/storage/StorageArea.cpp
index fae44036a066c4cc61dfe98bb32e0d1c107180a8..3cd823539d931546be49f2e7c6735c7244c5c04d 100644
--- a/third_party/WebKit/Source/modules/storage/StorageArea.cpp
+++ b/third_party/WebKit/Source/modules/storage/StorageArea.cpp
@@ -154,11 +154,6 @@ bool StorageArea::canAccessStorage(LocalFrame* frame)
     return result;
 }
 
-size_t StorageArea::memoryBytesUsedByCache()
-{
-    return m_storageArea->memoryBytesUsedByCache();
-}
-
 void StorageArea::dispatchLocalStorageEvent(const String& key, const String& oldValue, const String& newValue, SecurityOrigin* securityOrigin, const KURL& pageURL, WebStorageArea* sourceAreaInstance)
 {
     // Iterate over all pages that have a StorageNamespaceController supplement.