Revert of base: Use MADV_REMOVE instead of ftruncate to purge discardable memory segments.

base/memory/discardable_shared_memory.h

Index: base/memory/discardable_shared_memory.h
diff --git a/base/memory/discardable_shared_memory.h b/base/memory/discardable_shared_memory.h
index 0b5ac9fba8e5f7d9f82245720b69bd9c4051b49b..5dca884ca82e2d6665930905c92e990b8a5515c2 100644
--- a/base/memory/discardable_shared_memory.h
+++ b/base/memory/discardable_shared_memory.h
@@ -15,15 +15,10 @@
 #include <set>
 #endif
 
-// Linux (including Android) support the MADV_REMOVE argument with madvise()
-// which has the behavior of reliably causing zero-fill-on-demand pages to
-// be returned after a call. Here we define
-// DISCARDABLE_SHARED_MEMORY_ZERO_FILL_ON_DEMAND_PAGES_AFTER_PURGE on Linux
-// and Android to indicate that this type of behavior can be expected on
-// those platforms. Note that madvise() will still be used on other POSIX
-// platforms but doesn't provide the zero-fill-on-demand pages guarantee.
-#if defined(OS_LINUX) || defined(OS_ANDROID)
-#define DISCARDABLE_SHARED_MEMORY_ZERO_FILL_ON_DEMAND_PAGES_AFTER_PURGE
+// Define DISCARDABLE_SHARED_MEMORY_SHRINKING if platform supports shrinking
+// of discardable shared memory segments.
+#if defined(OS_POSIX) && !defined(OS_ANDROID)
+#define DISCARDABLE_SHARED_MEMORY_SHRINKING
 #endif
 
 namespace base {
@@ -129,6 +124,12 @@
     return shared_memory_.ShareToProcess(process_handle, new_handle);
   }
 
+#if defined(DISCARDABLE_SHARED_MEMORY_SHRINKING)
+  // Release as much memory as possible to the OS. The change in size will
+  // be reflected by the return value of mapped_size().
+  void Shrink();
+#endif
+
  private:
   // Virtual for tests.
   virtual Time Now() const;