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Control Flow Guard is a security feature that can help stop exploits. It
is primarily need on our official builds. On the debug and component
builds where Chromium is primarily developed it just adds a bit of
extra size to the object files.

This was fine until it triggered a spurious link error in component
builds when symbol_level=2 was selected. This wasn't caught by the bots
because most (all?) of them build with symbol_level=1, or non-component.

This turns off CFG for debug and component builds, thus getting those
builds working again for developers.

Bug: 1019970
Change-Id: I7a56af177452e62a5f3ad1daa608970cb9518d4f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1891991Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Auto-Submit: Bruce Dawson <brucedawson@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711083}