Check whether the plugin is disabled in OnIsInternalPluginRegisteredForMimeType().

chrome/renderer/media/chrome_key_systems.cc

Index: chrome/renderer/media/chrome_key_systems.cc
diff --git a/chrome/renderer/media/chrome_key_systems.cc b/chrome/renderer/media/chrome_key_systems.cc
index e8099fba1e9eb23abc16bdaa420b86353a8c3f50..c15d493bb2bcf6497f5572318285c0d7b3e04999 100644
--- a/chrome/renderer/media/chrome_key_systems.cc
+++ b/chrome/renderer/media/chrome_key_systems.cc
@@ -32,19 +32,19 @@ using content::KeySystemInfo;
 using content::SupportedCodecs;
 
 #if defined(ENABLE_PEPPER_CDMS)
-static bool IsPepperCdmRegistered(
+static bool IsPepperCdmAvailable(
     const std::string& pepper_type,
     std::vector<base::string16>* additional_param_names,
     std::vector<base::string16>* additional_param_values) {
-  bool is_registered = false;
+  bool is_available = false;
   content::RenderThread::Get()->Send(
-      new ChromeViewHostMsg_IsInternalPluginRegisteredForMimeType(
+      new ChromeViewHostMsg_IsInternalPluginAvailableForMimeType(
           pepper_type,
-          &is_registered,
+          &is_available,
           additional_param_names,
           additional_param_values));
 
-  return is_registered;
+  return is_available;
 }
 
 // External Clear Key (used for testing).
@@ -65,9 +65,9 @@ static void AddExternalClearKey(
 
   std::vector<base::string16> additional_param_names;
   std::vector<base::string16> additional_param_values;
-  if (!IsPepperCdmRegistered(kExternalClearKeyPepperType,
-                             &additional_param_names,
-                             &additional_param_values)) {
+  if (!IsPepperCdmAvailable(kExternalClearKeyPepperType,
+                            &additional_param_names,
+                            &additional_param_values)) {
     return;
   }
 
@@ -141,9 +141,9 @@ static void AddPepperBasedWidevine(
 
   std::vector<base::string16> additional_param_names;
   std::vector<base::string16> additional_param_values;
-  if (!IsPepperCdmRegistered(kWidevineCdmPluginMimeType,
-                             &additional_param_names,
-                             &additional_param_values)) {
+  if (!IsPepperCdmAvailable(kWidevineCdmPluginMimeType,
+                            &additional_param_names,
+                            &additional_param_values)) {
     DVLOG(1) << "Widevine CDM is not currently available.";
     return;
   }