Check whether the Pepper CDM is available before adding the key system.

content/browser/plugin_service_impl.cc

Index: content/browser/plugin_service_impl.cc
diff --git a/content/browser/plugin_service_impl.cc b/content/browser/plugin_service_impl.cc
index 5a79f7dcc845e43f15a74ca7e3b6a4bcd7b0eb06..5abe9e7b6d9a7528612173ed28e00d0932766892 100644
--- a/content/browser/plugin_service_impl.cc
+++ b/content/browser/plugin_service_impl.cc
@@ -658,7 +658,7 @@ void PluginServiceImpl::RegisterPepperPlugins() {
 PepperPluginInfo* PluginServiceImpl::GetRegisteredPpapiPluginInfo(
     const base::FilePath& plugin_path) {
   PepperPluginInfo* info = NULL;
-  for (size_t i = 0; i < ppapi_plugins_.size(); i++) {
+  for (size_t i = 0; i < ppapi_plugins_.size(); ++i) {
     if (ppapi_plugins_[i].path == plugin_path) {
       info = &ppapi_plugins_[i];
       break;
@@ -681,6 +681,20 @@ PepperPluginInfo* PluginServiceImpl::GetRegisteredPpapiPluginInfo(
   return &ppapi_plugins_[ppapi_plugins_.size() - 1];
 }
 
+bool PluginServiceImpl::IsPepperPluginRegisteredForMimeType(
+    const std::string& mime_type) {
+  for (size_t i = 0; i < ppapi_plugins_.size(); ++i) {
+    const std::vector<WebPluginMimeType>& mime_types =
+        ppapi_plugins_[i].mime_types;
+    for (size_t j = 0; j < mime_types.size(); ++j) {
+      if (mime_types[j].mime_type == mime_type)
+        return true;
+    }
+  }
+
+  return false;
+}
+
 #if defined(OS_POSIX) && !defined(OS_OPENBSD) && !defined(OS_ANDROID)
 // static
 void PluginServiceImpl::RegisterFilePathWatcher(FilePathWatcher* watcher,