Refactor our SimpleIndex file format and serialization to use Pickle instead of the previously bugg…

net/disk_cache/simple/simple_util.h

Index: net/disk_cache/simple/simple_util.h
diff --git a/net/disk_cache/simple/simple_util.h b/net/disk_cache/simple/simple_util.h
index 0b846608ebfe8e351177fc30c732804f312d7c68..579dbcf1754f66b710d6405d2534bdadec704f10 100644
--- a/net/disk_cache/simple/simple_util.h
+++ b/net/disk_cache/simple/simple_util.h
@@ -14,6 +14,21 @@ namespace disk_cache {
 
 namespace simple_util {
 
+std::string ConvertEntryHashKeyToHexString(uint64 hash_key);
+
+// |key| is the regular HTTP Cache key, which is a URL.
+// Returns the Hex ascii representation of the uint64 hash_key.
+std::string GetEntryHashKeyAsHexString(const std::string& key);
+
+// |key| is the regular HTTP Cache key, which is a URL.
+// Returns the hash of the key as uint64.
+uint64 GetEntryHashKey(const std::string& key);
+
+// Parses the |hash_key| string into a uint64 buffer.
+// |hash_key| string must be of the form: FFFFFFFFFFFFFFFF .
+bool GetEntryHashKeyFromHexString(const std::string& hash_key,
+                                  uint64* hash_key_out);
+
 // Given a |key| for a (potential) entry in the simple backend and the |index|
 // of a stream on that entry, returns the filename in which that stream would be
 // stored.