Refactor KeySystems code to call a function to populate the info. (relanding r221932)

content/public/renderer/key_system_info.cc

Index: content/public/renderer/key_system_info.cc
diff --git a/content/renderer/media/video_frame_provider.cc b/content/public/renderer/key_system_info.cc
similarity index 50%
copy from content/renderer/media/video_frame_provider.cc
copy to content/public/renderer/key_system_info.cc
index 48f50e06bd2b4595c024366a5120758008fdf65a..6a64fdbac0049ea49227ab981400a1d28aea8aad 100644
--- a/content/renderer/media/video_frame_provider.cc
+++ b/content/public/renderer/key_system_info.cc
@@ -2,12 +2,16 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "content/renderer/media/video_frame_provider.h"
+#include "content/public/renderer/key_system_info.h"
 
 namespace content {
 
-VideoFrameProvider::VideoFrameProvider() {}
+KeySystemInfo::KeySystemInfo(const std::string& key_system)
+    : key_system(key_system),
+      use_aes_decryptor(false) {
+}
 
-VideoFrameProvider::~VideoFrameProvider() {}
+KeySystemInfo::~KeySystemInfo() {
+}
 
 }  // namespace content