blink: Cleanup core class forward declarations

third_party/WebKit/Source/core/page/ChromeClient.h

Index: third_party/WebKit/Source/core/page/ChromeClient.h
diff --git a/third_party/WebKit/Source/core/page/ChromeClient.h b/third_party/WebKit/Source/core/page/ChromeClient.h
index b370905377536c5e01fd69cf59f10174bc745d33..68c85ab23daf56fe4e00c84a6a9a8e2801f00a06 100644
--- a/third_party/WebKit/Source/core/page/ChromeClient.h
+++ b/third_party/WebKit/Source/core/page/ChromeClient.h
@@ -57,17 +57,16 @@ class Element;
 class FileChooser;
 class FloatPoint;
 class Frame;
-class GraphicsContext;
 class GraphicsLayer;
 class HTMLFormControlElement;
 class HTMLInputElement;
 class HTMLSelectElement;
 class HitTestResult;
 class IntRect;
+class KeyboardEvent;
 class LocalFrame;
 class Node;
 class Page;
-class PaintArtifact;
 class PopupOpeningObserver;
 class WebDragData;
 class WebFrameScheduler;