Refactor TimeBase to post tasks. Workers to use real Idle tasks.

Source/web/tests/TextFinderTest.cpp

Index: Source/web/tests/TextFinderTest.cpp
diff --git a/Source/web/tests/TextFinderTest.cpp b/Source/web/tests/TextFinderTest.cpp
index 8e52ec365c84b1820fcc37deacbbb00cb604f254..be10b97b0315d08321b3007f9812c1dd62e7ec60 100644
--- a/Source/web/tests/TextFinderTest.cpp
+++ b/Source/web/tests/TextFinderTest.cpp
@@ -421,11 +421,6 @@ protected:
             return ensureFallback().monotonicallyIncreasingTime();
         }
 
-        virtual void setSharedTimerFireInterval(double interval) override
-        {
-            ensureFallback().setSharedTimerFireInterval(interval);
-        }
-
         virtual WebThread* currentThread() override { return ensureFallback().currentThread(); }
         virtual WebUnitTestSupport* unitTestSupport() override { return ensureFallback().unitTestSupport(); }
         virtual WebString defaultLocale() override { return ensureFallback().defaultLocale(); }