Remove all references to base/cxx17_backports.h in the code

[gz83]

According to the instructions of the following issue, we need to convert base::clamp to std::clamp. After this work is completed, the base/cxx17_backports.h file needs to be deleted. This work is still in progress.

https://bugs.chromium.org/p/chromium/issues/detail?id=1373621

At this stage, I found that only bazel/mini_chromium.BUILD needs to be modified in the code base of maldoca. The other references come from mini_chromium, and I have submitted the code to the mini_chromium code base.

[bobbybrown553]

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