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

chrome/common/chrome_content_client.cc

Index: chrome/common/chrome_content_client.cc
diff --git a/chrome/common/chrome_content_client.cc b/chrome/common/chrome_content_client.cc
index 3cd880da3a245ae8b6af76ebc0b27618c43ec585..8a0529a4edbb6168838e88ed354659f155894953 100644
--- a/chrome/common/chrome_content_client.cc
+++ b/chrome/common/chrome_content_client.cc
@@ -438,6 +438,13 @@ void ChromeContentClient::AddAdditionalSchemes(
 #endif
 }
 
+void ChromeContentClient::AddKeySystems(
+    std::vector<content::KeySystemInfo>* key_systems) {
+  // TODO(ddorwin): In the next CL, move code from
+  // content/renderer/media/crypto/key_systems_info.cc to chrome_key_systems.cc
+  // and call AddKeySystems.
+}
+
 bool ChromeContentClient::CanHandleWhileSwappedOut(
     const IPC::Message& msg) {
   // Any Chrome-specific messages (apart from those listed in