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Changes to use std:string as ScriptId type which has been changed to
base::StringPiece on CastWebContents. Using base::StringPiece breaks the
normal behavior of injecting JS bindings and the browsertest. Changing
it back to std::string fixed the problem.

Bug: internal b/163431947, b/132986916
Test: cast_shell_internal_browsertest, CQ
Change-Id: I2a4cef5f208880816a4be3068e4e460dd9cf9fcf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2350314Reviewed-by: Sean Topping <seantopping@chromium.org>
Auto-Submit: Jiawei Li <lijiawei@chromium.org>
Commit-Queue: Jiawei Li <lijiawei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797101}