Revert "converted GrCircleBlurFragmentProcessor to sksl"

This reverts commit 9b80ffc77b8000b493eb1226dc6ec21f1e99edfc.

Reason for revert: breaking ANGLE and Android Vulkan GMs

Original change's description:
> converted GrCircleBlurFragmentProcessor to sksl
> 
> Bug: skia:
> Change-Id: I1b70ba2003c9e9de2b5b9acadaf25c9ed59b1198
> Reviewed-on: https://skia-review.googlesource.com/21727
> Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>

TBR=bsalomon@google.com,ethannicholas@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: skia:
Change-Id: Ia313013b4354b34fa5a02bdb16d007a462c5ca94
Reviewed-on: https://skia-review.googlesource.com/22028
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
diff --git a/src/sksl/SkSLHCodeGenerator.cpp b/src/sksl/SkSLHCodeGenerator.cpp
index cd3f7f2..405fb0e 100644
--- a/src/sksl/SkSLHCodeGenerator.cpp
+++ b/src/sksl/SkSLHCodeGenerator.cpp
@@ -201,8 +201,6 @@
                  "#define %s_DEFINED\n",
                  fFullName.c_str(),
                  fFullName.c_str());
-    this->writef("#include \"SkTypes.h\"\n"
-                 "#if SK_SUPPORT_GPU\n");
     this->writeSection(HEADER_SECTION);
     this->writef("#include \"GrFragmentProcessor.h\"\n"
                  "#include \"GrCoordTransform.h\"\n"
@@ -233,8 +231,7 @@
     this->writef("    typedef GrFragmentProcessor INHERITED;\n"
                 "};\n");
     this->writeSection(HEADER_END_SECTION);
-    this->writef("#endif\n"
-                 "#endif\n");
+    this->writef("#endif\n");
     return 0 == fErrors.errorCount();
 }