Extracted ISchemeHandler into a file of its own, according to the "one file per class/type" pattern which is generally preferable.

Author: perlun

CefSharp/CefSharp.vcxproj

@@ -162,6 +162,7 @@
     <ClInclude Include="IRenderWebBrowser.h" />
     <ClInclude Include="IRequest.h" />
     <ClInclude Include="IRequestHandler.h" />
+    <ClInclude Include="ISchemeHandler.h" />
     <ClInclude Include="IWebBrowser.h" />
     <ClInclude Include="LoadCompletedEventArgs.h" />
     <ClInclude Include="MCefRefPtr.h" />

CefSharp/CefSharp.vcxproj.filters

@@ -187,5 +187,8 @@
     <ClInclude Include="SchemeHandlerResponse.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="ISchemeHandler.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>

CefSharp/ISchemeHandler.h

@@ -0,0 +1,18 @@
+#include "Stdafx.h"
+#include "Request.h"
+
+namespace CefSharp
+{
+    ref class SchemeHandlerResponse;
+    public delegate void OnRequestCompletedHandler();
+
+    public interface class ISchemeHandler
+    {
+        /// <summary>
+        /// Processes a custom scheme-based request asynchronously. The implementing method should call the callback whenever the
+        /// request is completed.
+        /// </summary>
+        /// <returns>true if the request is handled, false otherwise.</returns>
+        bool ProcessRequestAsync(IRequest^ request, SchemeHandlerResponse^ response, OnRequestCompletedHandler^ callback);
+    };
+}

CefSharp/SchemeHandlerWrapper.h

@@ -3,6 +3,7 @@
 
 #include "include/cef_scheme.h"
 #include "Request.h"
+#include "ISchemeHandler.h"
 
 using namespace System;
 using namespace System::IO;
@@ -11,18 +12,6 @@ namespace CefSharp
 {
     ref class SchemeHandlerResponse;
 
-    public delegate void OnRequestCompletedHandler();
-
-    public interface class ISchemeHandler
-    {
-        /// <summary>
-        /// Processes a custom scheme-based request asynchronously. The implementing method should call the callback whenever the
-        /// request is completed.
-        /// </summary>
-        /// <returns>true if the request is handled, false otherwise.</returns>
-        bool ProcessRequestAsync(IRequest^ request, SchemeHandlerResponse^ response, OnRequestCompletedHandler^ callback);
-    };
-
     public interface class ISchemeHandlerFactory
     {
         ISchemeHandler^ Create();