JSONWriter cleanup: integrate pretty print into write options.

remoting/host/json_host_config.cc

Index: remoting/host/json_host_config.cc
diff --git a/remoting/host/json_host_config.cc b/remoting/host/json_host_config.cc
index 97f1d74850dd6f5c8740d76b9f5e75e6ce170a7b..3bddb4ef30e15edded47f557f69631da59f29ecb 100644
--- a/remoting/host/json_host_config.cc
+++ b/remoting/host/json_host_config.cc
@@ -50,7 +50,9 @@ void JsonHostConfig::Save() {
 void JsonHostConfig::DoWrite() {
   std::string file_content;
   base::AutoLock auto_lock(lock_);
-  base::JSONWriter::Write(values_.get(), true, &file_content);
+  base::JSONWriter::WriteWithOptions(values_.get(),
+                                     base::JSONWriter::OPTIONS_PRETTY_PRINT,
+                                     &file_content);
   // TODO(sergeyu): Move ImportantFileWriter to base and use it here.
   file_util::WriteFile(filename_, file_content.c_str(), file_content.size());
 }