trivial: IWYU in SigninManagerAndroid

The class has no dependencies to ProfileManager.

R=nyquist@chromium.org

Bug: None
Change-Id: I67b998477a0dcff2970404f115d4118d018b9cbb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315153Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Commit-Queue: Tommy Nyquist <nyquist@chromium.org>
Auto-Submit: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792409}

chrome/browser/android/signin/signin_manager_android.cc

@@ -23,7 +23,7 @@
 #include "chrome/browser/browsing_data/chrome_browsing_data_remover_delegate.h"
 #include "chrome/browser/policy/cloud/user_policy_signin_service_factory.h"
 #include "chrome/browser/policy/cloud/user_policy_signin_service_mobile.h"
-#include "chrome/browser/profiles/profile_manager.h"
+#include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/signin/account_id_from_account_info.h"
 #include "chrome/browser/signin/identity_manager_factory.h"
 #include "components/google/core/common/google_util.h"
@@ -32,6 +32,7 @@
 #include "components/prefs/pref_service.h"
 #include "components/signin/public/base/signin_pref_names.h"
 #include "components/signin/public/identity_manager/identity_manager.h"
+#include "content/public/browser/browser_context.h"
 #include "content/public/browser/browsing_data_filter_builder.h"
 #include "content/public/browser/browsing_data_remover.h"
 #include "content/public/browser/storage_partition.h"