[Safe Browsing] Make scopes string for access token fetches public

This CL moves the scopes string used for safe browsing access token
fetches into safe_browsing_token_fetcher.h so that the WebLayer
implementation can reuse it rather than duplicating it.

Bug: 1080748
Change-Id: I14a028857fe30c70d59454287748704673461f4b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627310
Commit-Queue: Colin Blundell <blundell@chromium.org>
Reviewed-by: Xinghui Lu <xinghuilu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844488}

components/safe_browsing/core/browser/safe_browsing_token_fetcher.h

@@ -9,6 +9,9 @@
 
 namespace safe_browsing {
 
+constexpr char kAPIScope[] =
+    "https://www.googleapis.com/auth/chrome-safe-browsing";
+
 // This interface is used to fetch access tokens for communcations with Safe
 // Browsing. It asynchronously returns an access token for the current account
 // (as determined in concrete implementations), or the empty string if no access

components/safe_browsing/core/browser/sync/safe_browsing_primary_account_token_fetcher.cc

@@ -17,12 +17,6 @@
 
 namespace safe_browsing {
 
-namespace {
-
-const char kAPIScope[] = "https://www.googleapis.com/auth/chrome-safe-browsing";
-
-}  // namespace
-
 SafeBrowsingPrimaryAccountTokenFetcher::SafeBrowsingPrimaryAccountTokenFetcher(
     signin::IdentityManager* identity_manager)
     : identity_manager_(identity_manager),