Rename IdleCallbackDeadline to IdleDeadline to be in sync with spec.

Source/core/dom/IdleDeadline.cpp

Index: Source/core/dom/IdleDeadline.cpp
diff --git a/Source/core/dom/IdleCallbackDeadline.cpp b/Source/core/dom/IdleDeadline.cpp
similarity index 73%
rename from Source/core/dom/IdleCallbackDeadline.cpp
rename to Source/core/dom/IdleDeadline.cpp
index bd1ee9808c77a5fe0380b579c1a593176d74c022..ed7f04eb2d6dec18533ce8cd777009394d5044a9 100644
--- a/Source/core/dom/IdleCallbackDeadline.cpp
+++ b/Source/core/dom/IdleDeadline.cpp
@@ -3,19 +3,19 @@
 // found in the LICENSE file.
 
 #include "config.h"
-#include "core/dom/IdleCallbackDeadline.h"
+#include "core/dom/IdleDeadline.h"
 
 #include "wtf/CurrentTime.h"
 
 namespace blink {
 
-IdleCallbackDeadline::IdleCallbackDeadline(double deadlineSeconds, CallbackType callbackType)
+IdleDeadline::IdleDeadline(double deadlineSeconds, CallbackType callbackType)
     : m_deadlineSeconds(deadlineSeconds)
     , m_callbackType(callbackType)
 {
 }
 
-double IdleCallbackDeadline::timeRemaining() const
+double IdleDeadline::timeRemaining() const
 {
     double timeRemaining = m_deadlineSeconds - monotonicallyIncreasingTime();
     if (timeRemaining < 0)