memory-infra: Fix a unit conversion error for private memory footprint.

Bytes were being converted to kilobytes without a division.

BUG=707022

Review-Url: https://codereview.chromium.org/2914903002
Cr-Commit-Position: refs/heads/master@{#476241}

services/resource_coordinator/memory_instrumentation/coordinator_impl.cc

@@ -53,7 +53,7 @@ uint32_t CalculatePrivateFootprintKb(
     return (internal_bytes + compressed_bytes) / 1024;
   }
 #elif defined(OS_WIN)
-  return os_dump.platform_private_footprint.private_bytes;
+  return os_dump.platform_private_footprint.private_bytes / 1024;
 #else
   return 0;
 #endif