This CL applies clang-tidy's performance-faster-string-find [1] on the WebRTC codebase. All changes in this CL are automatically generated by both clang-tidy and 'git cl format'. [1] - https://clang.llvm.org/extra/clang-tidy/checks/performance-faster-string-find.html Bug: webrtc:10252 Change-Id: I4b8c0396836f3c325488e37d97037fa04742a5d2 Reviewed-on: https://webrtc-review.googlesource.com/c/120047 Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Cr-Commit-Position: refs/heads/master@{#26423}