Revert of Bind Window focus ability to the ExecutionContext instead of the process.

Source/core/dom/ExecutionContext.cpp

Index: Source/core/dom/ExecutionContext.cpp
diff --git a/Source/core/dom/ExecutionContext.cpp b/Source/core/dom/ExecutionContext.cpp
index 240a99d3fe3675b87db24d68d3a251f68b9a4435..887f2e70ee4a597c20c5fe8596055cf0084bb9fb 100644
--- a/Source/core/dom/ExecutionContext.cpp
+++ b/Source/core/dom/ExecutionContext.cpp
@@ -36,7 +36,6 @@
 #include "core/html/PublicURLManager.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/inspector/ScriptCallStack.h"
-#include "core/page/WindowFocusAllowedIndicator.h"
 #include "core/workers/WorkerGlobalScope.h"
 #include "core/workers/WorkerThread.h"
 #include "wtf/MainThread.h"
@@ -74,7 +73,6 @@
     , m_inDispatchErrorEvent(false)
     , m_activeDOMObjectsAreSuspended(false)
     , m_activeDOMObjectsAreStopped(false)
-    , m_windowFocusTokens(0)
 {
 }
 
@@ -271,26 +269,6 @@
         securityContext().setSecurityOrigin(SecurityOrigin::createUnique());
         didUpdateSecurityOrigin();
     }
-}
-
-void ExecutionContext::allowWindowFocus()
-{
-    ++m_windowFocusTokens;
-}
-
-void ExecutionContext::consumeWindowFocus()
-{
-    if (m_windowFocusTokens == 0)
-        return;
-    --m_windowFocusTokens;
-}
-
-bool ExecutionContext::isWindowFocusAllowed() const
-{
-    // FIXME: WindowFocusAllowedIndicator::windowFocusAllowed() is temporary,
-    // it will be removed as soon as WebScopedWindowFocusAllowedIndicator will
-    // be updated to not use WindowFocusAllowedIndicator.
-    return m_windowFocusTokens > 0 || WindowFocusAllowedIndicator::windowFocusAllowed();
 }
 
 void ExecutionContext::trace(Visitor* visitor)