Update DOMStorageHost patch for Chrome 30

This class was moved to content/browser/dom_storage and renamed in
http://src.chromium.org/viewvc/chrome?view=revision&revision=216211.

patches/dom_storage_host.patch

@@ -1,13 +1,13 @@
-Index: webkit/browser/dom_storage/dom_storage_host.h
+Index: content/browser/dom_storage/dom_storage_host.h
 ===================================================================
---- webkit/browser/dom_storage/dom_storage_host.h	(revision 194718)
-+++ webkit/browser/dom_storage/dom_storage_host.h	(working copy)
+--- content/browser/dom_storage/dom_storage_host.h	(revision 194718)
++++ content/browser/dom_storage/dom_storage_host.h	(working copy)
 @@ -65,6 +65,8 @@
  
-   scoped_refptr<DomStorageContext> context_;
+   scoped_refptr<DOMStorageContextImpl> context_;
    AreaMap connections_;
 +
-+  DISALLOW_COPY_AND_ASSIGN(DomStorageHost);
++  DISALLOW_COPY_AND_ASSIGN(DOMStorageHost);
  };
  
- }  // namespace dom_storage
+ }  // namespace content