Cleanup #include in //components/keyed_service/content

Remove unnecessary #includes from //components/keyed_service/content
after recent refactoring.

BUG=419366

Review URL: https://codereview.chromium.org/701463003

Cr-Commit-Position: refs/heads/master@{#302631}

components/keyed_service/content/browser_context_dependency_manager.cc

@@ -4,10 +4,8 @@
 
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 
-#include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "base/memory/singleton.h"
-#include "components/keyed_service/content/browser_context_keyed_base_factory.h"
 #include "content/public/browser/browser_context.h"
 
 #ifndef NDEBUG

components/keyed_service/content/browser_context_keyed_service_factory.cc

@@ -6,7 +6,6 @@
 
 #include "base/logging.h"
 #include "base/prefs/pref_service.h"
-#include "base/stl_util.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "components/pref_registry/pref_registry_syncable.h"

components/keyed_service/content/refcounted_browser_context_keyed_service_factory.cc

@@ -6,9 +6,7 @@
 
 #include "base/logging.h"
 #include "base/prefs/pref_service.h"
-#include "base/stl_util.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
-#include "components/keyed_service/core/keyed_service.h"
 #include "components/keyed_service/core/refcounted_keyed_service.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 #include "components/user_prefs/user_prefs.h"