Introduce the abstract class WebViewBase, to decouple WebViewImpl.

third_party/WebKit/Source/web/LocalFrameClientImpl.cpp

Index: third_party/WebKit/Source/web/LocalFrameClientImpl.cpp
diff --git a/third_party/WebKit/Source/web/LocalFrameClientImpl.cpp b/third_party/WebKit/Source/web/LocalFrameClientImpl.cpp
index ae19064b0caab95b2a57901b2310c0db0a1729fc..57244ef85a686828b04403191515f5340321f5f9 100644
--- a/third_party/WebKit/Source/web/LocalFrameClientImpl.cpp
+++ b/third_party/WebKit/Source/web/LocalFrameClientImpl.cpp
@@ -39,6 +39,7 @@
 #include "core/events/MouseEvent.h"
 #include "core/events/UIEventWithKeyState.h"
 #include "core/exported/WebDataSourceImpl.h"
+#include "core/exported/WebViewBase.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLFrameElementBase.h"
@@ -106,7 +107,6 @@
 #include "web/WebDevToolsFrontendImpl.h"
 #include "web/WebLocalFrameImpl.h"
 #include "web/WebPluginContainerImpl.h"
-#include "web/WebViewImpl.h"
 
 #include <memory>
 
@@ -424,7 +424,7 @@ void LocalFrameClientImpl::DispatchDidChangeThemeColor() {
 }
 
 static bool AllowCreatingBackgroundTabs() {
-  const WebInputEvent* input_event = WebViewImpl::CurrentInputEvent();
+  const WebInputEvent* input_event = WebViewBase::CurrentInputEvent();
   if (!input_event || (input_event->GetType() != WebInputEvent::kMouseUp &&
                        (input_event->GetType() != WebInputEvent::kRawKeyDown &&
                         input_event->GetType() != WebInputEvent::kKeyDown) &&
@@ -587,7 +587,7 @@ void LocalFrameClientImpl::LoadErrorPage(int reason) {
 }
 
 bool LocalFrameClientImpl::NavigateBackForward(int offset) const {
-  WebViewImpl* webview = web_frame_->ViewImpl();
+  WebViewBase* webview = web_frame_->ViewImpl();
   if (!webview->Client())
     return false;
 
@@ -937,7 +937,7 @@ void LocalFrameClientImpl::DispatchDidChangeManifest() {
 }
 
 unsigned LocalFrameClientImpl::BackForwardLength() {
-  WebViewImpl* webview = web_frame_->ViewImpl();
+  WebViewBase* webview = web_frame_->ViewImpl();
   if (!webview || !webview->Client())
     return 0;
   return webview->Client()->HistoryBackListCount() + 1 +