WebView: Cleanup class/struct forward declarations

android_webview/native/aw_contents_io_thread_client_impl.h

Index: android_webview/native/aw_contents_io_thread_client_impl.h
diff --git a/android_webview/native/aw_contents_io_thread_client_impl.h b/android_webview/native/aw_contents_io_thread_client_impl.h
index bb517e1b95e33ff56dda70abcf6e4acbef333525..41f365eb9fd7154d027f55052727853164fa5b22 100644
--- a/android_webview/native/aw_contents_io_thread_client_impl.h
+++ b/android_webview/native/aw_contents_io_thread_client_impl.h
@@ -12,10 +12,7 @@
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 
-class GURL;
-
 namespace content {
-class ResourceRequestInfo;
 class WebContents;
 }
 
@@ -25,8 +22,6 @@ class URLRequest;
 
 namespace android_webview {
 
-class AwWebResourceResponse;
-
 class AwContentsIoThreadClientImpl : public AwContentsIoThreadClient {
  public:
    // Called when AwContents is created before there is a Java client.