Revert of Fix free memory calculation.

base/process/process_metrics_ios.cc

Index: base/process/process_metrics_ios.cc
diff --git a/base/process/process_metrics_ios.cc b/base/process/process_metrics_ios.cc
index 2ed65ab37f9d422a53bf8faba33ec117cd9f67d5..e6b01192b5965c4a8151e655e5a9833e57676867 100644
--- a/base/process/process_metrics_ios.cc
+++ b/base/process/process_metrics_ios.cc
@@ -9,9 +9,7 @@
 #include <stddef.h>
 
 #include "base/logging.h"
-#include "base/mac/scoped_mach_port.h"
 #include "base/memory/ptr_util.h"
-#include "base/numerics/safe_conversions.h"
 
 namespace base {
 
@@ -27,6 +25,11 @@
 }
 
 }  // namespace
+
+SystemMemoryInfoKB::SystemMemoryInfoKB() : total(0), free(0) {}
+
+SystemMemoryInfoKB::SystemMemoryInfoKB(const SystemMemoryInfoKB& other) =
+    default;
 
 ProcessMetrics::ProcessMetrics(ProcessHandle process) {}
 
@@ -88,40 +91,11 @@
   return 0;
 }
 
+// Bytes committed by the system.
 bool GetSystemMemoryInfo(SystemMemoryInfoKB* meminfo) {
-  struct host_basic_info hostinfo;
-  mach_msg_type_number_t count = HOST_BASIC_INFO_COUNT;
-  base::mac::ScopedMachSendRight host(mach_host_self());
-  int result = host_info(host.get(), HOST_BASIC_INFO,
-                         reinterpret_cast<host_info_t>(&hostinfo), &count);
-  if (result != KERN_SUCCESS)
-    return false;
-
-  DCHECK_EQ(HOST_BASIC_INFO_COUNT, count);
-  meminfo->total = static_cast<int>(hostinfo.max_mem / 1024);
-
-  vm_statistics64_data_t vm_info;
-  count = HOST_VM_INFO64_COUNT;
-
-  if (host_statistics64(host.get(), HOST_VM_INFO64,
-                        reinterpret_cast<host_info64_t>(&vm_info),
-                        &count) != KERN_SUCCESS) {
-    return false;
-  }
-  DCHECK_EQ(HOST_VM_INFO64_COUNT, count);
-
-  // Check that PAGE_SIZE is divisible by 1024 (2^10).
-  CHECK_EQ(PAGE_SIZE, (PAGE_SIZE >> 10) << 10);
-  meminfo->free = saturated_cast<int>(
-      PAGE_SIZE / 1024 * (vm_info.free_count - vm_info.speculative_count));
-  meminfo->speculative =
-      saturated_cast<int>(PAGE_SIZE / 1024 * vm_info.speculative_count);
-  meminfo->file_backed =
-      saturated_cast<int>(PAGE_SIZE / 1024 * vm_info.external_page_count);
-  meminfo->purgeable =
-      saturated_cast<int>(PAGE_SIZE / 1024 * vm_info.purgeable_count);
-
-  return true;
+  // Unimplemented. Must enable unittest for IOS when this gets implemented.
+  NOTIMPLEMENTED();
+  return false;
 }
 
 }  // namespace base