Refactor KeySystems code to call a function to populate the info.

content/public/common/key_system_info.cc

Index: content/public/common/key_system_info.cc
diff --git a/content/public/common/file_chooser_params.cc b/content/public/common/key_system_info.cc
similarity index 51%
copy from content/public/common/file_chooser_params.cc
copy to content/public/common/key_system_info.cc
index c9c95710d84bab9c986e8faa4905078ee0950247..bec6d65e81a5f0e2062c71594a8fb4cd8e2d6e8c 100644
--- a/content/public/common/file_chooser_params.cc
+++ b/content/public/common/key_system_info.cc
@@ -2,14 +2,16 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "content/public/common/file_chooser_params.h"
+#include "content/public/common/key_system_info.h"
 
 namespace content {
 
-FileChooserParams::FileChooserParams() : mode(Open) {
+KeySystemInfo::KeySystemInfo(const std::string& key_system)
+    : key_system(key_system),
+      use_aes_decryptor(false) {
 }
 
-FileChooserParams::~FileChooserParams() {
+KeySystemInfo::~KeySystemInfo() {
 }
 
 }  // namespace content