Fix broken MSAA for RGBA

R=robertphillips@google.com

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/46763003

git-svn-id: http://skia.googlecode.com/svn/trunk/src@11979 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gpu/gl/GrGLCaps.cpp b/gpu/gl/GrGLCaps.cpp
index dce9851..e6bad38 100644
--- a/gpu/gl/GrGLCaps.cpp
+++ b/gpu/gl/GrGLCaps.cpp
@@ -399,7 +399,7 @@
 
     if (this->fRGBA8RenderbufferSupport) {
         fConfigRenderSupport[kRGBA_8888_GrPixelConfig][kNo_MSAA]  = true;
-        fConfigRenderSupport[kRGBA_4444_GrPixelConfig][kYes_MSAA]  = false;
+        fConfigRenderSupport[kRGBA_8888_GrPixelConfig][kYes_MSAA]  = true;
     }
 
     if (this->fBGRAFormatSupport) {