Introduce WebRemoteFrameBase to break dependencies on WebRemoteFrameImpl.

third_party/WebKit/Source/web/ChromeClientImpl.cpp

Index: third_party/WebKit/Source/web/ChromeClientImpl.cpp
diff --git a/third_party/WebKit/Source/web/ChromeClientImpl.cpp b/third_party/WebKit/Source/web/ChromeClientImpl.cpp
index fde3271c895d1e1da9767984f818d3b535279019..4fb3271e3a0dc24e6e9ba39c6515bf5ee70b7af7 100644
--- a/third_party/WebKit/Source/web/ChromeClientImpl.cpp
+++ b/third_party/WebKit/Source/web/ChromeClientImpl.cpp
@@ -123,6 +123,7 @@
 #include "web/WebInputEventConversion.h"
 #include "web/WebLocalFrameImpl.h"
 #include "web/WebPluginContainerImpl.h"
+#include "web/WebRemoteFrameImpl.h"
 #include "web/WebSettingsImpl.h"
 
 namespace blink {
@@ -957,6 +958,11 @@ WebLocalFrameBase* ChromeClientImpl::GetWebLocalFrameBase(LocalFrame* frame) {
   return WebLocalFrameImpl::FromFrame(frame);
 }
 
+WebRemoteFrameBase* ChromeClientImpl::GetWebRemoteFrameBase(
+    RemoteFrame& frame) {
+  return WebRemoteFrameImpl::FromFrame(frame);
+}
+
 void ChromeClientImpl::SetEventListenerProperties(
     LocalFrame* frame,
     WebEventListenerClass event_class,