Revert r12625 due to sandbox incompatibility.

src/spaces.h

Index: src/spaces.h
diff --git a/src/spaces.h b/src/spaces.h
index 4ccd7889583fe7266265718c5fd3c0dce9ff4340..97bcaa59ab4a6e0d4b31a2a954c292cdbfae5a35 100644
--- a/src/spaces.h
+++ b/src/spaces.h
@@ -653,8 +653,6 @@ class MemoryChunk {
     return static_cast<int>(area_end() - area_start());
   }
 
-  size_t CommittedPhysicalMemory();
-
  protected:
   MemoryChunk* next_chunk_;
   MemoryChunk* prev_chunk_;
@@ -1530,9 +1528,6 @@ class PagedSpace : public Space {
   // spaces this equals the capacity.
   intptr_t CommittedMemory() { return Capacity(); }
 
-  // Total amount of physical memory committed for this space.
-  size_t CommittedPhysicalMemory();
-
   // Sets the capacity, the available space and the wasted space to zero.
   // The stats are rebuilt during sweeping by adding each page to the
   // capacity and the size when it is encountered.  As free spaces are
@@ -1999,8 +1994,6 @@ class SemiSpace : public Space {
 
   static void Swap(SemiSpace* from, SemiSpace* to);
 
-  size_t CommittedPhysicalMemory();
-
  private:
   // Flips the semispace between being from-space and to-space.
   // Copies the flags into the masked positions on all pages in the space.
@@ -2198,12 +2191,6 @@ class NewSpace : public Space {
     return Capacity();
   }
 
-  size_t CommittedPhysicalMemory() {
-    return to_space_.CommittedPhysicalMemory()
-        + (from_space_.is_committed() ? from_space_.CommittedPhysicalMemory()
-                                      : 0);
-  }
-
   // Return the available bytes without growing.
   intptr_t Available() {
     return Capacity() - Size();
@@ -2571,8 +2558,6 @@ class LargeObjectSpace : public Space {
     return Size();
   }
 
-  size_t CommittedPhysicalMemory();
-
   int PageCount() {
     return page_count_;
   }