Use v8::kGCCallbackFlagCollectAllAvailableGarbage in Heap::CollectAllAvailableGarbage

Now that the embedder side supports v8::kGCCallbackFlagCollectAllAvailableGarbage,
this CL removes the old v8::kGCCallbackFlagForced from Heap::CollectAllAvailableGarbage.

BUG=591463
LOG=Y

Review URL: https://codereview.chromium.org/1769893002

Cr-Commit-Position: refs/heads/master@{#34539}

src/global-handles.cc

@@ -984,7 +984,7 @@ int GlobalHandles::PostGarbageCollectionProcessing(
   int freed_nodes = 0;
   bool synchronous_second_pass =
       (gc_callback_flags &
-       (kGCCallbackFlagForced |
+       (kGCCallbackFlagForced | kGCCallbackFlagCollectAllAvailableGarbage |
         kGCCallbackFlagSynchronousPhantomCallbackProcessing)) != 0;
   freed_nodes += DispatchPendingPhantomCallbacks(synchronous_second_pass);
   if (initial_post_gc_processing_count != post_gc_processing_count_) {

src/heap/heap.cc

@@ -895,7 +895,7 @@ void Heap::CollectAllAvailableGarbage(const char* gc_reason) {
   const int kMinNumberOfAttempts = 2;
   for (int attempt = 0; attempt < kMaxNumberOfAttempts; attempt++) {
     if (!CollectGarbage(MARK_COMPACTOR, gc_reason, NULL,
-                        v8::kGCCallbackFlagForced) &&
+                        v8::kGCCallbackFlagCollectAllAvailableGarbage) &&
         attempt + 1 >= kMinNumberOfAttempts) {
       break;
     }
@@ -1044,7 +1044,8 @@ bool Heap::CollectGarbage(GarbageCollector collector, const char* gc_reason,
   }
 
   if (collector == MARK_COMPACTOR &&
-      (gc_callback_flags & kGCCallbackFlagForced) != 0) {
+      (gc_callback_flags & (kGCCallbackFlagForced |
+                            kGCCallbackFlagCollectAllAvailableGarbage)) != 0) {
     isolate()->CountUsage(v8::Isolate::kForcedGC);
   }