DevTools: fix race conditions while recording film strips

Source/devtools/front_end/bindings/TempFile.js

Index: Source/devtools/front_end/bindings/TempFile.js
diff --git a/Source/devtools/front_end/bindings/TempFile.js b/Source/devtools/front_end/bindings/TempFile.js
index d9030a9aa0b66f44e9773aafdac699855a1c0ad3..60334c47fa26fb3897152b5dd129eb406cdba642 100644
--- a/Source/devtools/front_end/bindings/TempFile.js
+++ b/Source/devtools/front_end/bindings/TempFile.js
@@ -298,6 +298,9 @@ WebInspector.DeferredTempFile.prototype = {
 
     _writeNextChunk: function()
     {
+        // File was deleted while create or write was in-flight.
+        if (!this._tempFile)
+            return;
         var chunk = this._chunks.shift();
         this._isWriting = true;
         this._tempFile.write(/** @type {!Array.<string>} */(chunk.strings), this._didWriteChunk.bind(this, chunk.callback));