Revert of Let GC select the collector when the external memory allocation...

Revert of Let GC select the collector when the external memory allocation limit is reached (patchset #1 id:1 of https://codereview.chromium.org/1201993002/)

Reason for revert:
results in a scavenge storm if scavenge doesn't free enough memory

Original issue's description:
> Let GC select the collector when the external memory allocation limit is reached
>
> BUG=none
> R=hpayer@chromium.org
> LOG=n
>
> Committed: https://crrev.com/93d6216099b60e95bc816bcc913f8f841ee795b6
> Cr-Commit-Position: refs/heads/master@{#29235}

TBR=hpayer@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=none

Review URL: https://codereview.chromium.org/1215513004

Cr-Commit-Position: refs/heads/master@{#29383}

include/v8.h

@@ -5937,7 +5937,7 @@ class V8_EXPORT Isolate {
   void SetObjectGroupId(internal::Object** object, UniqueId id);
   void SetReferenceFromGroup(UniqueId id, internal::Object** object);
   void SetReference(internal::Object** parent, internal::Object** child);
-  void CollectGarbage(const char* gc_reason);
+  void CollectAllGarbage(const char* gc_reason);
 };
 
 class V8_EXPORT StartupData {
@@ -8177,7 +8177,7 @@ int64_t Isolate::AdjustAmountOfExternalAllocatedMemory(
   if (change_in_bytes > 0 &&
       amount - *amount_of_external_allocated_memory_at_last_global_gc >
           I::kExternalAllocationLimit) {
-    CollectGarbage("external memory allocation limit reached.");
+    CollectAllGarbage("external memory allocation limit reached.");
   }
   *amount_of_external_allocated_memory = amount;
   return *amount_of_external_allocated_memory;

src/api.cc

@@ -6974,9 +6974,9 @@ Local<Integer> v8::Integer::NewFromUnsigned(Isolate* isolate, uint32_t value) {
 }
 
 
-void Isolate::CollectGarbage(const char* gc_reason) {
-  reinterpret_cast<i::Isolate*>(this)->heap()->CollectGarbage(i::NEW_SPACE,
-                                                              gc_reason);
+void Isolate::CollectAllGarbage(const char* gc_reason) {
+  reinterpret_cast<i::Isolate*>(this)->heap()->CollectAllGarbage(
+      i::Heap::kNoGCFlags, gc_reason);
 }