QUIC - Added histograms to track how cache ie performing when server

net/http/disk_cache_based_quic_server_info.h

Index: net/http/disk_cache_based_quic_server_info.h
diff --git a/net/http/disk_cache_based_quic_server_info.h b/net/http/disk_cache_based_quic_server_info.h
index 7420f325e34074afd42ae1d1ac701f173e0601ab..6e15fc3b619b71b9390b4bc84c7eff449a6bbf8d 100644
--- a/net/http/disk_cache_based_quic_server_info.h
+++ b/net/http/disk_cache_based_quic_server_info.h
@@ -61,36 +61,6 @@ class NET_EXPORT_PRIVATE DiskCacheBasedQuicServerInfo
     NONE,
   };
 
-  // Enum to track number of times data read/parse/write API calls of
-  // QuicServerInfo to and from disk cache is called.
-  enum QuicServerInfoAPICall {
-    QUIC_SERVER_INFO_START = 0,
-    QUIC_SERVER_INFO_WAIT_FOR_DATA_READY = 1,
-    QUIC_SERVER_INFO_PARSE = 2,
-    QUIC_SERVER_INFO_WAIT_FOR_DATA_READY_CANCEL = 3,
-    QUIC_SERVER_INFO_READY_TO_PERSIST = 4,
-    QUIC_SERVER_INFO_PERSIST = 5,
-    QUIC_SERVER_INFO_EXTERNAL_CACHE_HIT = 6,
-    QUIC_SERVER_INFO_NUM_OF_API_CALLS = 7,
-  };
-
-  // Enum to track failure reasons to read/load/write of QuicServerInfo to
-  // and from disk cache.
-  enum FailureReason {
-    WAIT_FOR_DATA_READY_INVALID_ARGUMENT_FAILURE = 0,
-    GET_BACKEND_FAILURE = 1,
-    OPEN_FAILURE = 2,
-    CREATE_OR_OPEN_FAILURE = 3,
-    PARSE_NO_DATA_FAILURE = 4,
-    PARSE_FAILURE = 5,
-    READ_FAILURE = 6,
-    READY_TO_PERSIST_FAILURE = 7,
-    PERSIST_NO_BACKEND_FAILURE = 8,
-    WRITE_FAILURE = 9,
-    NO_FAILURE = 10,
-    NUM_OF_FAILURES = 11,
-  };
-
   ~DiskCacheBasedQuicServerInfo() override;
 
   // Persists |pending_write_data_| if it is not empty, otherwise serializes the