Create a new FileSystemOperationRunner for each FileAPIMessageFilter

content/browser/fileapi/fileapi_message_filter.h

Index: content/browser/fileapi/fileapi_message_filter.h
diff --git a/content/browser/fileapi/fileapi_message_filter.h b/content/browser/fileapi/fileapi_message_filter.h
index 9d7f8bb86c3549ece0467ae537e0bf6326e5acd8..ed3b8d80b481323f62713af3fb021b0dd97a5d5d 100644
--- a/content/browser/fileapi/fileapi_message_filter.h
+++ b/content/browser/fileapi/fileapi_message_filter.h
@@ -32,6 +32,7 @@ class Time;
 namespace fileapi {
 class FileSystemURL;
 class FileSystemContext;
+class FileSystemOperationRunner;
 struct DirectoryEntry;
 }
 
@@ -169,7 +170,9 @@ class CONTENT_EXPORT FileAPIMessageFilter : public BrowserMessageFilter {
                              int permissions,
                              base::PlatformFileError* error);
 
-  fileapi::FileSystemOperationRunner* operation_runner();
+  fileapi::FileSystemOperationRunner* operation_runner() {
+    return operation_runner_.get();
+  }
 
   int process_id_;
 
@@ -187,6 +190,8 @@ class CONTENT_EXPORT FileAPIMessageFilter : public BrowserMessageFilter {
 
   scoped_refptr<ChromeBlobStorageContext> blob_storage_context_;
 
+  scoped_ptr<fileapi::FileSystemOperationRunner> operation_runner_;
+
   // Keep track of blob URLs registered in this process. Need to unregister
   // all of them when the renderer process dies.
   base::hash_set<std::string> blob_urls_;