Oilpan: revert page navigation count GCing.

third_party/WebKit/Source/platform/heap/ThreadState.cpp

Index: third_party/WebKit/Source/platform/heap/ThreadState.cpp
diff --git a/third_party/WebKit/Source/platform/heap/ThreadState.cpp b/third_party/WebKit/Source/platform/heap/ThreadState.cpp
index ad0e78144a21ce5f2dd7559dc777e3eb656896c3..4a1efe48e8904b9f5bcf581155bcf3d28980ee82 100644
--- a/third_party/WebKit/Source/platform/heap/ThreadState.cpp
+++ b/third_party/WebKit/Source/platform/heap/ThreadState.cpp
@@ -99,7 +99,6 @@ ThreadState::ThreadState()
     , m_gcForbiddenCount(0)
     , m_persistentAllocated(0)
     , m_persistentFreed(0)
-    , m_pageNavigationCount(0)
     , m_vectorBackingHeapIndex(Vector1HeapIndex)
     , m_currentHeapAges(0)
     , m_isTerminating(false)
@@ -704,17 +703,6 @@ void ThreadState::schedulePageNavigationGCIfNeeded(float estimatedRemovalRatio)
     ASSERT(!isSweepingInProgress());
     ASSERT(!sweepForbidden());
 
-    m_pageNavigationCount++;
-    if (m_pageNavigationCount >= 5) {
-        // A frame retains a lot of memory in the V8 side. V8's GC cannot
-        // collect the memory until Oilpan's GC collects the frame. So we
-        // for a conservative GC if no Oilpan's GC has been observed in
-        // the past 5 frame navigations.
-        //
-        Heap::collectGarbage(HeapPointersOnStack, GCWithoutSweep, Heap::ConservativeGC);
-        return;
-    }
-
     if (shouldSchedulePageNavigationGC(estimatedRemovalRatio))
         schedulePageNavigationGC();
 }
@@ -998,7 +986,6 @@ void ThreadState::preGC()
     flushHeapDoesNotContainCacheIfNeeded();
     clearHeapAges();
     updatePersistentCounters();
-    m_pageNavigationCount = 0;
 }
 
 void ThreadState::postGC(GCType gcType)