Revert of Oilpan: Implement a GC to take a heap snapshot

Source/platform/heap/ThreadState.cpp

Index: Source/platform/heap/ThreadState.cpp
diff --git a/Source/platform/heap/ThreadState.cpp b/Source/platform/heap/ThreadState.cpp
index 1ef1d11ab3cad926f2f4719da4ec47ae1f4aa177..47d9c817abe92f99d5994400413fcd7d15f2993e 100644
--- a/Source/platform/heap/ThreadState.cpp
+++ b/Source/platform/heap/ThreadState.cpp
@@ -850,13 +850,6 @@
         m_heaps[i]->makeConsistentForGC();
 }
 
-void ThreadState::makeConsistentForMutator()
-{
-    ASSERT(isInGC());
-    for (int i = 0; i < NumberOfHeaps; ++i)
-        m_heaps[i]->makeConsistentForMutator();
-}
-
 void ThreadState::preGC()
 {
     ASSERT(!isInGC());
@@ -889,23 +882,9 @@
     }
 #endif
 
+    setGCState(gcType == GCWithSweep ? EagerSweepScheduled : LazySweepScheduled);
     for (int i = 0; i < NumberOfHeaps; i++)
         m_heaps[i]->prepareForSweep();
-
-    if (gcType == GCWithSweep) {
-        setGCState(EagerSweepScheduled);
-    } else if (gcType == GCWithoutSweep) {
-        setGCState(LazySweepScheduled);
-    } else {
-        takeSnapshot();
-
-        // This unmarks all marked objects and marks all unmarked objects dead.
-        makeConsistentForMutator();
-
-        // Force setting NoGCScheduled to circumvent checkThread()
-        // in setGCState().
-        m_gcState = NoGCScheduled;
-    }
 }
 
 void ThreadState::preSweep()
@@ -1290,12 +1269,6 @@
     m_likelyToBePromptlyFreed[entryIndex] += 3;
 }
 
-void ThreadState::takeSnapshot()
-{
-    ASSERT(isInGC());
-    // TODO(ssid): Implement this.
-}
-
 #if ENABLE(GC_PROFILING)
 const GCInfo* ThreadState::findGCInfoFromAllThreads(Address address)
 {