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This reverts commit a5707a7d.

Reason for revert: Likely the cause of test failure in AccountPickerDialogFragmentTest on android builders:
* https://ci.chromium.org/p/chromium/builders/ci/android-arm64-proguard-rel/2755
* https://ci.chromium.org/p/chromium/builders/ci/android-pie-x86-rel/2363

The error said:
Attempt to invoke virtual method 'boolean org.chromium.base.ObserverList.c(java.lang.Object)' on a null object reference
	at org.chromium.components.signin.identitymanager.IdentityManager.addObserver(IdentityManager.java:95)
	at org.chromium.chrome.browser.signin.ProfileDataCache.addObserver(ProfileDataCache.java:211)

Original change's description:
> [Android][Signin] Add observer to listen to monogram update
>
> This CL adds an observer to update ProfileDataCache when user's profile
> photo(include monogram) from IdentityManager is updated.
>
> Bug: 1127886
> Change-Id: I0c70f72708e50dceb63eb122055315f7818cba06
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2430984
> Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
> Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
> Commit-Queue: Alice Wang <aliceywang@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#811237}

TBR=msarda@chromium.org,bsazonov@chromium.org,aliceywang@chromium.org

Change-Id: I91562cb8017c2a74afd391fede5d9b206e7e6b5d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1127886
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2435151Reviewed-by: Haiyang Pan <hypan@google.com>
Commit-Queue: Haiyang Pan <hypan@google.com>
Cr-Commit-Position: refs/heads/master@{#811317}