Merge IsConnectedToXXX functions into one IsCapabilityActive function

This CL:
a. Move DeviceConnectionType into WebContents and rename it to CapabilityType
b. Merge all IsConnectedToXXX() functions into a single IsCapabilityActive() function
c. Rename OnDeviceConnectionTypesChanged() method to OnCapabilityTypesChanged().

Bug: 372836924
Change-Id: Ib8be8821dff459c3788aeeb0fc4921f3996ec069
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5938280
Reviewed-by: Patrick Monette <pmonette@chromium.org>
Commit-Queue: Yifan Luo <lyf@chromium.org>
Reviewed-by: Matt Reynolds <mattreynolds@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1372240}