Merge "Remove unused String8::setPathName." am: 40a0664b84 am: 5f7d548dc6 am: 941b1a61b0

Original change: https://android-review.googlesource.com/c/platform/system/core/+/1765465

Change-Id: I2fcc66e3bf09f9b317c32833df03cd3950ce74ce