Fix messaging delete bug

[hsubox76]

deleteService() wasn't populated with a value so when _delete() tries to call it, there's an error. I think this pattern was copied from functions-exp where the constructor assigns a value to deleteService(). But it never gets assigned here, so just inlining the Promise.resolve().

[changeset-bot]

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Latest commit: 1218b5d

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[google-oss-bot]

Binary Size Report

Affected SDKs

No changes between base commit (645e166) and head commit (622ee8e).

Test Logs

• Base (645e1668): https://github.com/firebase/firebase-js-sdk/actions/runs/918970690
• Head (622ee8eb): https://github.com/firebase/firebase-js-sdk/actions/runs/919154159

[google-oss-bot]

Size Analysis Report

Affected Products

• @firebase/messaging-exp

  • deleteToken

    Size Table

    Type	Base (645e166)	Head (622ee8e)	Diff
    size	8.93 kB	8.93 kB	-3 B (-0.0%)
    size-with-ext-deps	26.7 kB	26.7 kB	-3 B (-0.0%)

  • getMessaging

    Size Table

    Type	Base (645e166)	Head (622ee8e)	Diff
    size	5.09 kB	5.09 kB	-3 B (-0.1%)
    size-with-ext-deps	23.4 kB	23.4 kB	-3 B (-0.0%)

  • getToken

    Size Table

    Type	Base (645e166)	Head (622ee8e)	Diff
    size	12.0 kB	12.0 kB	-3 B (-0.0%)
    size-with-ext-deps	29.8 kB	29.8 kB	-3 B (-0.0%)

  • isSupported

    Size Table

    Type	Base (645e166)	Head (622ee8e)	Diff
    size	4.98 kB	4.97 kB	-3 B (-0.1%)
    size-with-ext-deps	22.6 kB	22.6 kB	-3 B (-0.0%)

  • onMessage

    Size Table

    Type	Base (645e166)	Head (622ee8e)	Diff
    size	5.17 kB	5.16 kB	-3 B (-0.1%)
    size-with-ext-deps	22.8 kB	22.8 kB	-3 B (-0.0%)

Test Logs

• Base (645e166): https://github.com/firebase/firebase-js-sdk/actions/runs/918970690
• Head (622ee8e): https://github.com/firebase/firebase-js-sdk/actions/runs/919154159