Make initialization of the QuicInMemoryCache explicit to avoid spooky action at a distance which co…

net/tools/quic/quic_in_memory_cache.h

Index: net/tools/quic/quic_in_memory_cache.h
diff --git a/net/tools/quic/quic_in_memory_cache.h b/net/tools/quic/quic_in_memory_cache.h
index f92c67922df9235fa166b577755b6ebecaa8fa4d..aaff60b2d1aeaa137ee85096e437357dfc696531 100644
--- a/net/tools/quic/quic_in_memory_cache.h
+++ b/net/tools/quic/quic_in_memory_cache.h
@@ -21,8 +21,6 @@ namespace test {
 class QuicInMemoryCachePeer;
 }  // namespace
 
-extern std::string FLAGS_quic_in_memory_cache_dir;
-
 class QuicServer;
 
 // In-memory cache for HTTP responses.
@@ -93,6 +91,9 @@ class QuicInMemoryCache {
                           base::StringPiece path,
                           SpecialResponseType response_type);
 
+  // |cache_cirectory| can be generated using `wget -p --save-headers <url>`.
+  void InitializeFromDirectory(const std::string& cache_directory);
+
  private:
   typedef base::hash_map<std::string, Response*> ResponseMap;
   friend struct DefaultSingletonTraits<QuicInMemoryCache>;
@@ -103,8 +104,6 @@ class QuicInMemoryCache {
 
   void ResetForTests();
 
-  void Initialize();
-
   void AddResponseImpl(base::StringPiece host,
                        base::StringPiece path,
                        SpecialResponseType response_type,