Remove --simple-data-source and convert WebMediaPlayerImpl::Initialize() to a void function.

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index 246e6e267c95927d7595993c6f2e5f79762d656a..6e6b2b1fe6df4e3111760a9c79c6658ca2fd3fc8 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -463,10 +463,6 @@ const char kServiceProcess[]                = "service";
 // Visibly render a border around paint rects in the web page to help debug
 // and study painting behavior.
 const char kShowPaintRects[]                = "show-paint-rects";
-//
-// TODO(scherkus): remove --simple-data-source when our media resource loading
-// is cleaned up and playback testing completed.
-const char kSimpleDataSource[]              = "simple-data-source";
 
 // Runs the renderer and plugins in the same process as the browser
 const char kSingleProcess[]                 = "single-process";