[automated] Drop needless <vector> includes in /components/feedback

This is among the most costful includes for the Chromium build.
https://commondatastorage.googleapis.com/chromium-browser-clang/include-analysis.html

This batch of CLs attempts to detect and remove leftover includes with a
heuristic: choose files which don't contain 'std::vector' or 'push_back'.
This doesn't really guarantee that std::vector is not being used, as
shown by the snippets below, so please review carefully.
```
auto v = GetVector();
MyVectorAlias v = GetVector();
my_vector_ = GetVector();
```

This CL was uploaded by git cl split.

R=jimmyxgong@chromium.org

Bug: 1233968
Change-Id: I4d34f696e67c0ce95127adc8eca742bf6cb41d3d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3059439


Auto-Submit: Victor Vianna <victorvianna@google.com>
Reviewed-by: Jimmy Gong <jimmyxgong@chromium.org>
Commit-Queue: Victor Vianna <victorvianna@google.com>
Cr-Commit-Position: refs/heads/master@{#910215}