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Including the WebContents header fails when a target doesn't depend on
content. Instead, we should only forward declare these classes in the
Cast web primary interfaces (CastWebContents, CastWebView,
CastContentWindow).

Merge-With: eureka-internal/461423

Bug: None
Test: CQ
Change-Id: Id18c669c7d39f4ed847a8c4970f5d6c8847a234c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2454370Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Commit-Queue: Sean Topping <seantopping@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814466}