Rename file to comply with the style guide.

Author: hzr

src/client-en.xml

@@ -369,7 +369,7 @@ window.load_screen_timeout = window.setTimeout(function()
 <script src="./ecma-debugger/stop_at.js"/>
 <script src="./ecma-debugger/runtime_onload_handler.js"/>
 <script src="./ecma-debugger/views-runtimes.js"/>
-<script src="./ecma-debugger/view_return_values.js"/>
+<script src="./ecma-debugger/return_values_view.js"/>
 <script src="./ecma-debugger/view_callstack.js"/>
 <script src="./ecma-debugger/views.js"/>
 <script src="./ecma-debugger/view_js_sidepanel.js"/>