Introduce the abstract class WebViewBase, to decouple WebViewImpl.

third_party/WebKit/Source/web/SpellCheckerClientImpl.cpp

Index: third_party/WebKit/Source/web/SpellCheckerClientImpl.cpp
diff --git a/third_party/WebKit/Source/web/SpellCheckerClientImpl.cpp b/third_party/WebKit/Source/web/SpellCheckerClientImpl.cpp
index 555a756e624588fa9bff3b13ebefd86cdc07aaed..9857d45e8bd79ba593cf8a71149c3368d133625a 100644
--- a/third_party/WebKit/Source/web/SpellCheckerClientImpl.cpp
+++ b/third_party/WebKit/Source/web/SpellCheckerClientImpl.cpp
@@ -29,14 +29,14 @@
 #include "core/dom/Element.h"
 #include "core/editing/markers/DocumentMarkerController.h"
 #include "core/editing/spellcheck/SpellChecker.h"
+#include "core/exported/WebViewBase.h"
 #include "core/frame/LocalFrame.h"
 #include "core/page/Page.h"
 #include "public/web/WebSpellCheckClient.h"
-#include "web/WebViewImpl.h"
 
 namespace blink {
 
-SpellCheckerClientImpl::SpellCheckerClientImpl(WebViewImpl* webview)
+SpellCheckerClientImpl::SpellCheckerClientImpl(WebViewBase* webview)
     : web_view_(webview),
       spell_check_this_field_status_(kSpellCheckAutomatic) {}