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CastWebContents now provides a getter to access QueryableDataHost. If
InitParams::provide_queryable_data_host is set false, the getter will
return a nullptr (for non Cast application page).

Merge-With: eureka-internal/342948

Bug: internal b/144316072
Test: CQ
Change-Id: I44a2aefbed9fcdcf5481423d073ffc42a8ee358d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1956252Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Reviewed-by: Sean Topping <seantopping@chromium.org>
Commit-Queue: Jiawei Li <lijiawei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722720}