safe_browsing: Simplify code in ReadData() by calling base::MD5String().

chrome/browser/safe_browsing/malware_details_cache.cc

Index: chrome/browser/safe_browsing/malware_details_cache.cc
diff --git a/chrome/browser/safe_browsing/malware_details_cache.cc b/chrome/browser/safe_browsing/malware_details_cache.cc
index ac27102885855bb3fbb1883569247debfa44f6f7..d97d99180bfcc9beddce91befcc5bbe410378d20 100644
--- a/chrome/browser/safe_browsing/malware_details_cache.cc
+++ b/chrome/browser/safe_browsing/malware_details_cache.cc
@@ -179,9 +179,7 @@ void MalwareDetailsCacheCollector::ReadData(
     pb_response->set_body(data);
   }
   pb_response->set_bodylength(data.size());
-  base::MD5Digest digest;
-  base::MD5Sum(data.c_str(), data.size(), &digest);
-  pb_response->set_bodydigest(base::MD5DigestToBase16(digest));
+  pb_response->set_bodydigest(base::MD5String(data));
 }
 
 void MalwareDetailsCacheCollector::AdvanceEntry() {