jni: Pass method parameters as JavaParamRef in content.

content/browser/android/tracing_controller_android.h

Index: content/browser/android/tracing_controller_android.h
diff --git a/content/browser/android/tracing_controller_android.h b/content/browser/android/tracing_controller_android.h
index 58e6b94d36bf2e694a2ef7b06c121233e43e8b80..09f16483b7a099e9f1eefa8965ba711f5a3c7b4f 100644
--- a/content/browser/android/tracing_controller_android.h
+++ b/content/browser/android/tracing_controller_android.h
@@ -17,14 +17,18 @@ namespace content {
 class TracingControllerAndroid {
  public:
   TracingControllerAndroid(JNIEnv* env, jobject obj);
-  void Destroy(JNIEnv* env, jobject obj);
+  void Destroy(JNIEnv* env, const base::android::JavaParamRef<jobject>& obj);
 
   bool StartTracing(JNIEnv* env,
-                    jobject obj,
-                    jstring categories,
-                    jstring trace_options);
-  void StopTracing(JNIEnv* env, jobject obj, jstring jfilepath);
-  bool GetKnownCategoryGroupsAsync(JNIEnv* env, jobject obj);
+                    const base::android::JavaParamRef<jobject>& obj,
+                    const base::android::JavaParamRef<jstring>& categories,
+                    const base::android::JavaParamRef<jstring>& trace_options);
+  void StopTracing(JNIEnv* env,
+                   const base::android::JavaParamRef<jobject>& obj,
+                   const base::android::JavaParamRef<jstring>& jfilepath);
+  bool GetKnownCategoryGroupsAsync(
+      JNIEnv* env,
+      const base::android::JavaParamRef<jobject>& obj);
   static void GenerateTracingFilePath(base::FilePath* file_path);
 
  private: