Revert r12625 due to sandbox incompatibility.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 74e0a0b4c223e9bb39f2361194f9a9ac3c18f3dc..dcadf52a6a64dcb2a6022fbbe80a10fff2d3ad33 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -4306,7 +4306,6 @@ bool v8::V8::Dispose() {
 
 HeapStatistics::HeapStatistics(): total_heap_size_(0),
                                   total_heap_size_executable_(0),
-                                  total_physical_size_(0),
                                   used_heap_size_(0),
                                   heap_size_limit_(0) { }
 
@@ -4316,7 +4315,6 @@ void v8::V8::GetHeapStatistics(HeapStatistics* heap_statistics) {
     // Isolate is unitialized thus heap is not configured yet.
     heap_statistics->set_total_heap_size(0);
     heap_statistics->set_total_heap_size_executable(0);
-    heap_statistics->set_total_physical_size(0);
     heap_statistics->set_used_heap_size(0);
     heap_statistics->set_heap_size_limit(0);
     return;
@@ -4326,7 +4324,6 @@ void v8::V8::GetHeapStatistics(HeapStatistics* heap_statistics) {
   heap_statistics->set_total_heap_size(heap->CommittedMemory());
   heap_statistics->set_total_heap_size_executable(
       heap->CommittedMemoryExecutable());
-  heap_statistics->set_total_physical_size(heap->CommittedPhysicalMemory());
   heap_statistics->set_used_heap_size(heap->SizeOfObjects());
   heap_statistics->set_heap_size_limit(heap->MaxReserved());
 }