Replace deprecated getLastUsedProfile function in PaymentRequestImpl.

|Profile#getLastUsedProfile| is deprecated and replaced with
|Profile#getLastUsedRegularProfile|. This CL updates PaymentRequestImpl
class.

Note: This change is only code clean-up, does not change any behavior.

Bug: 1041781
Change-Id: I799acc986566e41846fe0ea7d71c14990ae72bca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2050373Reviewed-by: Sahel Sharify <sahel@chromium.org>
Reviewed-by: Ramin Halavati <rhalavati@chromium.org>
Commit-Queue: Side YILMAZ <sideyilmaz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741398}

chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentRequestImpl.java

@@ -904,8 +904,11 @@ public class PaymentRequestImpl
                 SecurityStateModel.getSecurityLevelForWebContents(mWebContents),
                 new ShippingStrings(mShippingType), mPaymentUisShowStateReconciler);
 
+        // TODO(https://crbug.com/1048632): Use the current profile (i.e., regular profile or
+        // incognito profile) instead of always using regular profile. It works correctly now, but
+        // it is not safe.
         final FaviconHelper faviconHelper = new FaviconHelper();
-        faviconHelper.getLocalFaviconImageForURL(Profile.getLastUsedProfile(),
+        faviconHelper.getLocalFaviconImageForURL(Profile.getLastUsedRegularProfile(),
                 mWebContents.getLastCommittedUrl(),
                 activity.getResources().getDimensionPixelSize(R.dimen.payments_favicon_size),
                 (bitmap, iconUrl) -> {