Remove use of a V8 handle outside of bindings code in TimingInput.cpp.

Source/core/animation/TimingInput.cpp

Index: Source/core/animation/TimingInput.cpp
diff --git a/Source/core/animation/TimingInput.cpp b/Source/core/animation/TimingInput.cpp
index e8e325c643b9729145ecd9130ac38997965e9dc7..3a17c534b2bf3839a32d498fd9f9611e8a36b792 100644
--- a/Source/core/animation/TimingInput.cpp
+++ b/Source/core/animation/TimingInput.cpp
@@ -127,9 +127,8 @@ Timing TimingInput::convert(const Dictionary& timingInputDictionary)
     timingInputDictionary.get("iterations", iterationCount);
     setIterationCount(result, iterationCount);
 
-    v8::Local<v8::Value> iterationDurationValue;
-    if (timingInputDictionary.get("duration", iterationDurationValue)) {
-        double iterationDuration = iterationDurationValue->NumberValue();
+    double iterationDuration = 0;
+    if (timingInputDictionary.get("duration", iterationDuration)) {
         setIterationDuration(result, iterationDuration);
     }