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

Constantly calling glEnable(GL_SCISSOR_TEST) costs us a few ms/frame on some hardware.
As it turns out, we never disable the scissor test so we can just leave it on all the
time.

BUG=


Review URL: https://chromiumcodereview.appspot.com/11378004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@166632 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/cc/software_renderer.cc b/cc/software_renderer.cc
index fca2a2a..896bad43 100644
--- a/cc/software_renderer.cc
+++ b/cc/software_renderer.cc
@@ -138,17 +138,11 @@
     return true;
 }
 
-void SoftwareRenderer::enableScissorTestRect(const gfx::Rect& scissorRect)
+void SoftwareRenderer::setScissorTestRect(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()) {