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Change all GCs in internals-observe-gc.html to precise GC in an attempt to fix the failures on Win7 bot.

Bug: 1011714
Change-Id: Ie9c101b01b3ca28dc87c927ddc2cf73eec1b991e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1844525Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Keishi Hattori <keishi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703277}