Split HistoryClient in two objects

chrome/browser/history/android/android_provider_backend.h

Index: chrome/browser/history/android/android_provider_backend.h
diff --git a/chrome/browser/history/android/android_provider_backend.h b/chrome/browser/history/android/android_provider_backend.h
index f1a36bac46cf49ad7c4a96e8c7ce2c979c208dc9..03994a8013d5c02a3b4615b10523c5479b7061ef 100644
--- a/chrome/browser/history/android/android_provider_backend.h
+++ b/chrome/browser/history/android/android_provider_backend.h
@@ -24,8 +24,8 @@ namespace history {
 class AndroidProviderBackend;
 class AndroidURLsSQLHandler;
 class HistoryBackend;
+class HistoryBackendClient;
 class HistoryBackendNotifier;
-class HistoryClient;
 class HistoryDatabase;
 class ThumbnailDatabase;
 
@@ -48,7 +48,7 @@ class AndroidProviderBackend : public base::SupportsUserData::Data {
   AndroidProviderBackend(const base::FilePath& cache_db_name,
                          HistoryDatabase* history_db,
                          ThumbnailDatabase* thumbnail_db,
-                         HistoryClient* history_client,
+                         HistoryBackendClient* backend_client,
                          HistoryBackendNotifier* notifier);
 
   ~AndroidProviderBackend() override;
@@ -339,7 +339,7 @@ class AndroidProviderBackend : public base::SupportsUserData::Data {
 
   ThumbnailDatabase* thumbnail_db_;
 
-  HistoryClient* history_client_;
+  HistoryBackendClient* backend_client_;
 
   // Whether AndroidProviderBackend has been initialized.
   bool initialized_;