Change Firestore credentials to use shared_ptr

[a-maurice]

Description

Provide details of the change, and generalize the change in the PR title above.

Change Firestore's Auth and App Check credentials to use shared_ptr's instead of unique_ptr. This is because the iOS repo changed to use shared_ptrs recently, and the mismatch seems to be causing runtime errors. See firebase/firebase-ios-sdk#15558

Fixes firebase/firebase-unity-sdk#1383

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Testing

Describe how you've tested these changes. Link any manually triggered Integration tests or CPP binary SDK Packaging Github Action workflows, if applicable.

Running tests locally

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Type of Change

Place an x the applicable box:

• Bug fix. Add the issue # below if applicable.
• New feature. A non-breaking change which adds functionality.
• Other, such as a build process or documentation change.

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Notes

• Bug fixes and feature changes require an update to the Release Notes section of release_build_files/readme.md.
• Read the contribution guidelines CONTRIBUTING.md.
• Changes to the public API require an internal API review. If you'd like to help us make Firebase APIs better, please propose your change in a feature request so that we can discuss it together.

[gemini-code-assist]

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[github-actions]

✅  Integration test succeeded!

Requested by @a-maurice on commit c7fd131
Last updated: Mon Feb 23 17:04 PST 2026
View integration test log & download artifacts

[a-maurice]

/gemini review

[gemini-code-assist]

Code Review

This pull request correctly replaces std::unique_ptr with std::shared_ptr for Firestore's authentication and App Check credentials providers. This change is necessary to align with the iOS SDK and resolve runtime errors. The modifications are applied consistently across all relevant files, including function signatures, implementations, and test utilities. The release notes have also been updated to reflect this fix. I have one minor suggestion regarding include order to better align with style guidelines.

[gemini-code-assist]

To adhere to the Google C++ Style Guide for include order, C++ standard library headers like <memory> should be placed before project-specific headers. Please move this include before #include "firestore/src/main/create_credentials_provider.h".

[cherylEnkidu]

Thank you for the fix!