Revert r12625 due to sandbox incompatibility.

src/platform-win32.cc

Index: src/platform-win32.cc
diff --git a/src/platform-win32.cc b/src/platform-win32.cc
index f10b46e6f6bb2cd348e6fe852487d26798d9c2d8..49463be8e00fbf8ab022e71ba8af5fccaf0f2f09 100644
--- a/src/platform-win32.cc
+++ b/src/platform-win32.cc
@@ -1551,13 +1551,6 @@ bool VirtualMemory::ReleaseRegion(void* base, size_t size) {
 }
 
 
-bool VirtualMemory::CommittedPhysicalSizeInRegion(
-    void* base, size_t size, size_t* physical) {
-  // TODO(alph): implement for the platform.
-  return false;
-}
-
-
 // ----------------------------------------------------------------------------
 // Win32 thread support.