Revert of make gm background colors 565 compatible (patchset #2 id:20001 of https://codereview.chromium.org/1176243006/)

Reason for revert:
breaks many bots with refcnt error

Original issue's description:
> make gm background colors 565 compatible
>
> Change a batch of GM tests to convert their background color
> so that it is representable in 8888 and 565.
>
> Enable portable text in those same tests to minimize platform
> differences.
>
> In a couple of bitmap tests, use portable typefaces instead of
> choosing 'Times' which may or may not be available on the platform.
>
> R=borenet@google.com
>
> Committed: https://skia.googlesource.com/skia/+/be7f768a357aefb39c42d24b81b24d647bb6ab70

TBR=borenet@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1184123002
diff --git a/gm/blurs.cpp b/gm/blurs.cpp
index e7b66d5..3fae2b3 100644
--- a/gm/blurs.cpp
+++ b/gm/blurs.cpp
@@ -12,7 +12,7 @@
 class BlursGM : public skiagm::GM {
 public:
     BlursGM() {
-        this->setBGColor(sk_tool_utils::color_to_565(0xFFDDDDDD));
+        this->setBGColor(0xFFDDDDDD);
     }
 
 protected: