Remove DirectRenderer::disableScissorTest, always leave GL_SCISSOR_TEST enabled in GlRenderer

cc/software_renderer.cc

Index: cc/software_renderer.cc
diff --git a/cc/software_renderer.cc b/cc/software_renderer.cc
index a32160d55c42c40689f19b1320f0f227f0f001c1..fb9f74616c2e1c948e174f6955d0b63dda23c8b9 100644
--- a/cc/software_renderer.cc
+++ b/cc/software_renderer.cc
@@ -143,12 +143,6 @@ void SoftwareRenderer::enableScissorTestRect(const gfx::Rect& scissorRect)
     m_skCurrentCanvas->clipRect(toSkRect(scissorRect), SkRegion::kReplace_Op);
 }
 
-void SoftwareRenderer::disableScissorTest()
-{
-    gfx::Rect canvasRect(gfx::Point(), viewportSize());
-    m_skCurrentCanvas->clipRect(toSkRect(canvasRect), SkRegion::kReplace_Op);
-}
-
 void SoftwareRenderer::clearFramebuffer(DrawingFrame& frame)
 {
     if (frame.currentRenderPass->hasTransparentBackground()) {