Revert 3 CLs for shouldOverrideUrlLoading implementation.

android_webview/common/render_view_messages.h

Index: android_webview/common/render_view_messages.h
diff --git a/android_webview/common/render_view_messages.h b/android_webview/common/render_view_messages.h
index 4c42f3d0c1ad74a548869158c7a3d7cb8fca9d76..24df3cd6fbb3de598e836f7367d1f7b7c4b18fa8 100644
--- a/android_webview/common/render_view_messages.h
+++ b/android_webview/common/render_view_messages.h
@@ -100,6 +100,20 @@ IPC_MESSAGE_ROUTED1(AwViewHostMsg_UpdateHitTestData,
 IPC_MESSAGE_ROUTED1(AwViewHostMsg_OnContentsSizeChanged,
                     gfx::Size /* contents_size */)
 
+// Sent immediately before a top level navigation is initiated within Blink.
+// There are some exlusions, the most important ones are it is not sent
+// when creating a popup window, and not sent for application initiated
+// navigations. See AwContentRendererClient::HandleNavigation for all
+// cornercases. This is sent before updating the NavigationController state
+// or creating a URLRequest for the main frame resource.
+IPC_SYNC_MESSAGE_CONTROL5_1(AwViewHostMsg_ShouldOverrideUrlLoading,
+                            int /* render_frame_id id */,
+                            base::string16 /* in - url */,
+                            bool /* in - has_user_gesture */,
+                            bool /* in - is_redirect */,
+                            bool /* in - is_main_frame */,
+                            bool /* out - result */)
+
 // Sent when a subframe is created.
 IPC_MESSAGE_CONTROL2(AwViewHostMsg_SubFrameCreated,
                      int /* parent_render_frame_id */,