Change other usages of .size() to .empty() when applicable.

net/base/dnssec_chain_verifier.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/base/dnssec_chain_verifier.h"
 
 #include "base/logging.h"
 #include "base/scoped_ptr.h"
 #include "base/sha1.h"
 #include "base/sha2.h"
@@ skipping 714 matching lines @@
 
   for (unsigned i = 0; i < num_ds; i++) {
     uint8 digest_type;
     base::StringPiece digest;
     if (!U8(&digest_type) ||
         !VariableLength16(&digest)) {
       return BAD_DATA;
     }
 
     digest_types[i] = digest_type;
-    if (digest.size() > 0) {
+    lookahead[i] = digest.empty();
+    if (!digest.empty())
       (*rrdatas)[i] = digest;
-      lookahead[i] = false;
-    } else {
-      lookahead[i] = true;
-    }
   }
 
   base::StringPiece next_entry_key;
   if (!ReadAheadEntryKey(&next_entry_key))
     return BAD_DATA;
   if (next_entry_key.size() < 4)
     return BAD_DATA;
   uint16 keyid = DNSSECKeySet::DNSKEYToKeyID(next_entry_key);
   uint8 algorithm = next_entry_key[3];
 
@@ skipping 53 matching lines @@
   base::StringPiece name;
   if (!ReadName(&name))
     return BAD_DATA;
 
   rrdatas->resize(1);
   (*rrdatas)[0] = name;
   return OK;
 }
 
 }  // namespace net