v4_update_protocol_manager: Basic implementation with TODOs

components/safe_browsing_db/v4_get_hash_protocol_manager.h

Index: components/safe_browsing_db/v4_get_hash_protocol_manager.h
diff --git a/components/safe_browsing_db/v4_get_hash_protocol_manager.h b/components/safe_browsing_db/v4_get_hash_protocol_manager.h
index f0bfc7410c0ad5d91c6d89882e944b40cee06441..398fd03beaf4816c255a09814895bdeee0a37c38 100644
--- a/components/safe_browsing_db/v4_get_hash_protocol_manager.h
+++ b/components/safe_browsing_db/v4_get_hash_protocol_manager.h
@@ -48,6 +48,8 @@ class V4GetHashProtocolManager : public net::URLFetcherDelegate,
                               const base::TimeDelta&)>
       FullHashCallback;
 
+  typedef V4ProtocolManagerUtil::OperationResultType OperationResultType;
+
   ~V4GetHashProtocolManager() override;
 
   // Makes the passed |factory| the factory used to instantiate
@@ -78,35 +80,8 @@ class V4GetHashProtocolManager : public net::URLFetcherDelegate,
   virtual void GetFullHashesWithApis(const std::vector<SBPrefix>& prefixes,
                                      FullHashCallback callback);
 
-  // Enumerate failures for histogramming purposes.  DO NOT CHANGE THE
-  // ORDERING OF THESE VALUES.
-  enum ResultType {
-    // 200 response code means that the server recognized the hash
-    // prefix.
-    GET_HASH_STATUS_200 = 0,
-
-    // Subset of successful responses where the response body wasn't parsable.
-    GET_HASH_PARSE_ERROR = 1,
-
-    // Gethash request failed (network error).
-    GET_HASH_NETWORK_ERROR = 2,
-
-    // Gethash request returned HTTP result code other than 200.
-    GET_HASH_HTTP_ERROR = 3,
-
-    // Gethash attempted during error backoff, no request sent.
-    GET_HASH_BACKOFF_ERROR = 4,
-
-    // Gethash attempted before min wait duration elapsed, no request sent.
-    GET_HASH_MIN_WAIT_DURATION_ERROR = 5,
-
-    // Memory space for histograms is determined by the max.  ALWAYS
-    // ADD NEW VALUES BEFORE THIS ONE.
-    GET_HASH_RESULT_MAX = 6
-  };
-
   // Record a GetHash result.
-  static void RecordGetHashResult(ResultType result_type);
+  static void RecordGetHashResult(OperationResultType result_type);
 
  protected:
   // Constructs a V4GetHashProtocolManager that issues