Bug 984008, part 1 - Remove trailing whitespace from nsWebBrowserPersist. r=ehsan
Bug 984008, part 2 - Convert nsWebBrowserPersist::mOutputMap to nsClassHashtable. r=ehsan
Bug 984008, part 3 - Convert nsWebBrowserPersist::mUploadList to nsClassHashtable. r=ehsan
Bug 984008, part 4 - Remove nsISupportsKey. r=froydnj