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

cc/direct_renderer.cc

Index: cc/direct_renderer.cc
diff --git a/cc/direct_renderer.cc b/cc/direct_renderer.cc
index ea891a96ed1d6c7c41a7ff46b07f849b73cc8606..4c9e2ef7a227a493114001ac617fd2d1bd0ddd01 100644
--- a/cc/direct_renderer.cc
+++ b/cc/direct_renderer.cc
@@ -181,14 +181,14 @@ void DirectRenderer::drawRenderPass(DrawingFrame& frame, const RenderPass* rende
         frame.scissorRectInRenderPassSpace.Intersect(damageRectInRenderPassSpace);
     }
 
-    enableScissorTestRect(moveScissorToWindowSpace(frame, frame.scissorRectInRenderPassSpace));
+    setScissorTestRect(moveScissorToWindowSpace(frame, frame.scissorRectInRenderPassSpace));
     clearFramebuffer(frame);
 
     const QuadList& quadList = renderPass->quadList();
     for (QuadList::constBackToFrontIterator it = quadList.backToFrontBegin(); it != quadList.backToFrontEnd(); ++it) {
         gfx::RectF quadScissorRect = gfx::IntersectRects(frame.scissorRectInRenderPassSpace, (*it)->clippedRectInTarget());
         if (!quadScissorRect.IsEmpty()) {
-            enableScissorTestRect(moveScissorToWindowSpace(frame, quadScissorRect));
+            setScissorTestRect(moveScissorToWindowSpace(frame, quadScissorRect));
             drawQuad(frame, *it);
         }
     }