Change set_continuous_parameters() for removing duplicated behavior.

chrome/browser/speech/tts_controller.h

Index: chrome/browser/speech/tts_controller.h
diff --git a/chrome/browser/speech/tts_controller.h b/chrome/browser/speech/tts_controller.h
index 8f32cd93c152b47125a7bc6751e541088fba41db..6b005c4aac9bb393e2bdecfb26783e9c633cc826 100644
--- a/chrome/browser/speech/tts_controller.h
+++ b/chrome/browser/speech/tts_controller.h
@@ -172,8 +172,12 @@ class Utterance {
   }
   TtsGenderType gender() const { return gender_; }
 
-  void set_continuous_parameters(const UtteranceContinuousParameters& params) {
-    continuous_parameters_ = params;
+  void set_continuous_parameters(const double rate,
+                                 const double pitch,
+                                 const double volume) {
+    continuous_parameters_.rate = rate;
+    continuous_parameters_.pitch = pitch;
+    continuous_parameters_.volume = volume;
   }
   const UtteranceContinuousParameters& continuous_parameters() {
     return continuous_parameters_;