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This new member function allows the caller to modify an element in-place
safely. The existing options to do this right now is either use
const_cast<> then call Update() manually (was done by tests), or remove
then reinsert the modified element afterwards. The issue with the later
option is that you can't keep using the same HeapHandle pointer as it
cleared during the removal.

Bug: 971272
Change-Id: I202daa322f1160d601ffffa87ceb6a4dad0e291f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2530370Reviewed-by: Albert J. Wong <ajwong@chromium.org>
Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Commit-Queue: Patrick Monette <pmonette@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827928}