JSONWriter cleanup: integrate pretty print into write options.

chrome/test/webdriver/webdriver_session.cc

Index: chrome/test/webdriver/webdriver_session.cc
diff --git a/chrome/test/webdriver/webdriver_session.cc b/chrome/test/webdriver/webdriver_session.cc
index 7a45145011d3de8ec38332c30bb25f7e3ba2dce7..6faabd6f95e33c377700c94a8e52819552a79bd9 100644
--- a/chrome/test/webdriver/webdriver_session.cc
+++ b/chrome/test/webdriver/webdriver_session.cc
@@ -164,7 +164,6 @@ Error* Session::ExecuteScript(const FrameId& frame_id,
                               Value** value) {
   std::string args_as_json;
   base::JSONWriter::Write(static_cast<const Value* const>(args),
-                          /*pretty_print=*/false,
                           &args_as_json);
 
   // Every injected script is fed through the executeScript atom. This atom
@@ -217,7 +216,6 @@ Error* Session::ExecuteAsyncScript(const FrameId& frame_id,
                                    Value** value) {
   std::string args_as_json;
   base::JSONWriter::Write(static_cast<const Value* const>(args),
-                          /*pretty_print=*/false,
                           &args_as_json);
 
   int timeout_ms = async_script_timeout();