BrowserCdmManager: remove CDMs on correct thread on RenderFrameDeleted.

content/browser/media/cdm/browser_cdm_manager.cc

Index: content/browser/media/cdm/browser_cdm_manager.cc
diff --git a/content/browser/media/cdm/browser_cdm_manager.cc b/content/browser/media/cdm/browser_cdm_manager.cc
index d3d4630cb08b54547ac2494d541e47b9589d7875..99c763d9360e33824b37a267274d3dc0fa8b0027 100644
--- a/content/browser/media/cdm/browser_cdm_manager.cc
+++ b/content/browser/media/cdm/browser_cdm_manager.cc
@@ -122,16 +122,14 @@ media::BrowserCdm* BrowserCdmManager::GetCdm(int render_frame_id, int cdm_id) {
 }
 
 void BrowserCdmManager::RenderFrameDeleted(int render_frame_id) {
-  DCHECK(task_runner_->RunsTasksOnCurrentThread());
-
-  std::vector<uint64> ids_to_remove;
-  for (CdmMap::iterator it = cdm_map_.begin(); it != cdm_map_.end(); ++it) {
-    if (IdBelongsToFrame(it->first, render_frame_id))
-      ids_to_remove.push_back(it->first);
+  if (!task_runner_->RunsTasksOnCurrentThread()) {
+    task_runner_->PostTask(
+        FROM_HERE,
+        base::Bind(&BrowserCdmManager::RemoveAllCdmForFrame,
+                   this, render_frame_id));
+    return;
   }
-
-  for (size_t i = 0; i < ids_to_remove.size(); ++i)
-    RemoveCdm(ids_to_remove[i]);
+  RemoveAllCdmForFrame(render_frame_id);
 }
 
 void BrowserCdmManager::OnSessionCreated(int render_frame_id,
@@ -345,6 +343,19 @@ void BrowserCdmManager::AddCdm(int render_frame_id,
   cdm_security_origin_map_[id] = security_origin;
 }
 
+void BrowserCdmManager::RemoveAllCdmForFrame(int render_frame_id) {
+  DCHECK(task_runner_->RunsTasksOnCurrentThread());
+
+  std::vector<uint64> ids_to_remove;
+  for (CdmMap::iterator it = cdm_map_.begin(); it != cdm_map_.end(); ++it) {
+    if (IdBelongsToFrame(it->first, render_frame_id))
+      ids_to_remove.push_back(it->first);
+  }
+
+  for (size_t i = 0; i < ids_to_remove.size(); ++i)
+    RemoveCdm(ids_to_remove[i]);
+}
+
 void BrowserCdmManager::RemoveCdm(uint64 id) {
   DCHECK(task_runner_->RunsTasksOnCurrentThread());