Android should be able to discard CachedResources

Source/core/loader/cache/CachedResource.h

Index: Source/core/loader/cache/CachedResource.h
diff --git a/Source/core/loader/cache/CachedResource.h b/Source/core/loader/cache/CachedResource.h
index 302d3ed97cc2bad6be75f6e20914d807d5271097..a02d089bf17bc12761f20850d33e8bf4dfe7589f 100644
--- a/Source/core/loader/cache/CachedResource.h
+++ b/Source/core/loader/cache/CachedResource.h
@@ -27,7 +27,6 @@
 #include "core/loader/FrameLoaderTypes.h"
 #include "core/loader/ResourceLoaderOptions.h"
 #include "core/loader/cache/CachePolicy.h"
-#include "core/platform/PurgePriority.h"
 #include "core/platform/Timer.h"
 #include "core/platform/network/ResourceError.h"
 #include "core/platform/network/ResourceLoadPriority.h"
@@ -297,8 +296,6 @@ private:
     void revalidationSucceeded(const ResourceResponse&);
     void revalidationFailed();
 
-    virtual PurgePriority purgePriority() const { return PurgeDefault; }
-
     double currentAge() const;
     double freshnessLifetime() const;