Merge "Drop String8::std_string" into main am: 9cbae9d75b am: 5e890d37e9

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2745821

Change-Id: I0ba4393d498ba601d9427851e4aecde5962790a8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>