JSONWriter cleanup: integrate pretty print into write options.

net/base/transport_security_state.cc

Index: net/base/transport_security_state.cc
diff --git a/net/base/transport_security_state.cc b/net/base/transport_security_state.cc
index b73b18ad129f4c5058bcd395a446cca6abbd0671..7bc0a31310403fa49f2150e1feff7496ecaa4921 100644
--- a/net/base/transport_security_state.cc
+++ b/net/base/transport_security_state.cc
@@ -877,7 +877,9 @@ bool TransportSecurityState::Serialise(std::string* output) {
     toplevel.Set(HashedDomainToExternalString(i->first), state);
   }
 
-  base::JSONWriter::Write(&toplevel, true /* pretty print */, output);
+  base::JSONWriter::WriteWithOptions(&toplevel,
+                                     base::JSONWriter::OPTIONS_PRETTY_PRINT,
+                                     output);
   return true;
 }