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Now that the flags for browser plugin have been removed, we remove the
code to support browser plugin from the guest view JS implementation.

Bug: 533069
Change-Id: Ida04f0ce856d0f318835d6369558a3e38cac47e9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1943579Reviewed-by: James MacLean <wjmaclean@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Commit-Queue: Kevin McNee <mcnee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720593}