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In unit-tests, g_browser_process->profile_manager() can return null.
When the DestroyProfileOnBrowserClose flag is enabled (via
ScopedFeatureList, or fieldtrial_testing_config.json),
ScopedProfileKeepAlive causes a crash.

Add a guard in ScopedProfileKeepAlive(), so it's a no-op if there is no
ProfileManager.

Bug: 88586
Change-Id: Ife9f198da3d7dc69f8cf59bed80aca9c57517a6d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2614859
Auto-Submit: Nicolas Ouellet-Payeur <nicolaso@chromium.org>
Commit-Queue: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841088}