Use an agnostic renderer in Buffer, rather than D3D9-specific.

src/libGLESv2/Buffer.cpp

@@ -17,8 +17,7 @@ namespace gl
 
 Buffer::Buffer(rx::Renderer *renderer, GLuint id) : RefCountObject(id)
 {
-    ASSERT(dynamic_cast<rx::Renderer9*>(renderer) != NULL); // D3D9_REPLACE
-    mRenderer = static_cast<rx::Renderer9*>(renderer);
+    mRenderer = renderer;
     mContents = NULL;
     mSize = 0;
     mUsage = GL_DYNAMIC_DRAW;

src/libGLESv2/Buffer.h

@@ -52,7 +52,7 @@ class Buffer : public RefCountObject
   private:
     DISALLOW_COPY_AND_ASSIGN(Buffer);
 
-    rx::Renderer9 *mRenderer;  // D3D9_REPLACE
+    rx::Renderer *mRenderer;
     GLubyte *mContents;
     GLsizeiptr mSize;
     GLenum mUsage;