Cleanup android specific code of //chrome/browser/history

Forward-declare AndroidHistoryProviderService in history_service.h
instead of including android_history_provider_service.h since the
type is only used for a friendship declaration.

BUG=371820

Review URL: https://codereview.chromium.org/285763004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272464 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/history/history_service.h

@@ -39,9 +39,8 @@
 #include "ui/base/layout.h"
 
 #if defined(OS_ANDROID)
-#include "chrome/browser/history/android/android_history_provider_service.h"
+class AndroidHistoryProviderService;
 #endif
-
 class BookmarkService;
 class GURL;
 class HistoryURLProvider;