cobalt: Disable Media Remoting

[jasonzhangxx]

Disable the media remoting and media remoting RPC build flags in the
common configuration. Cobalt does not use these features, which
include Casting and Remoter Mojo endpoints. Disabling them can
reduce libchrobalt.so size and eliminate runtime memory overhead
of unused mojo EndpointClient.

Bug: 557781504

[github-actions]

🤖 Gemini Suggested Commit Message

---

build: Disable Media Remoting

Disable the media remoting and media remoting RPC build flags in the
common configuration. Cobalt does not support these features, which
include Casting and Remoter Mojo endpoints. This change helps keep the
media stack clean of unused components.

Bug: 557781504

---

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1. Influence the Result: Want to change the output? You can write custom prompts or instructions directly in the Pull Request description. The model uses that text to generate the message.
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[github-actions]

Context	State	Description
CI / android	✅ PASS	Passed
CI / aosp	✅ PASS	Passed
CI / evergreen	✅ PASS	Passed
CI / linux	✅ PASS	Passed
CI / tvos	✅ PASS	Passed
import/copybara	✅ PASS	Change imported to Gerrit
kokoro	✅ PASS	Kokoro build finished

[github-actions]

Context	State	Description
CI / evergreen	⏳ PENDING	Checks are running
CI / tvos	⏳ PENDING	Checks are running

[gemini-code-assist]

Code Review

This pull request disables Media Remoting (Casting and Remoter Mojo endpoints) for Cobalt by setting enable_media_remoting and enable_media_remoting_rpc to false in the common build configuration file (cobalt/build/configs/common.gn). There are no review comments, and I have no feedback to provide.

[borongc]

Disabling them can reduce libchrobalt.so size and eliminate runtime memory overhead of unused mojo EndpointClient.

Do you have numbers? It is required to put the saving MB in the PR description if it can save the binary size.

[borongc]

Probably put this at the end of this file as these are newly added. And how many it saves should be in the comment as well.