Fix names of arguments to SimpleEntryImpl::ChecksumOperationComplete

The header had them reversed compared to the implementation
(https://cs.chromium.org/chromium/src/net/disk_cache/simple/simple_entry_impl.cc?rcl=7f44763d0280f85ef331e31f2ea9dd93b3bf6ed3&l=1350)

Also remove abbreviation orig_ -> original_

(and the callers). No executable effect, just makes reading the
code a little easier.

Review-Url: https://codereview.chromium.org/2808763003
Cr-Commit-Position: refs/heads/master@{#463674}

net/disk_cache/simple/simple_entry_impl.cc

@@ -1347,7 +1347,7 @@ void SimpleEntryImpl::DoomOperationComplete(
 }
 
 void SimpleEntryImpl::ChecksumOperationComplete(
-    int orig_result,
+    int original_result,
     int stream_index,
     const CompletionCallback& completion_callback,
     std::unique_ptr<int> result) {
@@ -1362,8 +1362,8 @@ void SimpleEntryImpl::ChecksumOperationComplete(
   }
 
   if (*result == net::OK) {
-    *result = orig_result;
-    if (orig_result >= 0)
+    *result = original_result;
+    if (original_result >= 0)
       RecordReadResult(cache_type_, READ_RESULT_SUCCESS);
     else
       RecordReadResult(cache_type_, READ_RESULT_SYNC_READ_FAILURE);

net/disk_cache/simple/simple_entry_impl.h

@@ -280,8 +280,8 @@ class NET_EXPORT_PRIVATE SimpleEntryImpl : public Entry,
   // Called after validating the checksums on an entry. Passes through the
   // original result if successful, propagates the error if the checksum does
   // not validate.
-  void ChecksumOperationComplete(int stream_index,
-                                 int orig_result,
+  void ChecksumOperationComplete(int original_result,
+                                 int stream_index,
                                  const CompletionCallback& completion_callback,
                                  std::unique_ptr<int> result);