switched SkSL's temporary 'highfloat' type back to 'float'

Bug: skia:
Change-Id: If0debae7318b6b5b4a7cb85d458996a09931127e
Reviewed-on: https://skia-review.googlesource.com/48760
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/effects/GrBitmapTextGeoProc.cpp b/src/gpu/effects/GrBitmapTextGeoProc.cpp
index ad96951..0997b9e 100644
--- a/src/gpu/effects/GrBitmapTextGeoProc.cpp
+++ b/src/gpu/effects/GrBitmapTextGeoProc.cpp
@@ -32,12 +32,12 @@
 
         const char* atlasSizeInvName;
         fAtlasSizeInvUniform = uniformHandler->addUniform(kVertex_GrShaderFlag,
-                                                          kHighFloat2_GrSLType,
+                                                          kFloat2_GrSLType,
                                                           kHigh_GrSLPrecision,
                                                           "AtlasSizeInv",
                                                           &atlasSizeInvName);
 
-        GrGLSLVertToFrag uv(kHighFloat2_GrSLType);
+        GrGLSLVertToFrag uv(kFloat2_GrSLType);
         GrGLSLVertToFrag texIdx(kHalf_GrSLType);
         append_index_uv_varyings(args, btgp.inTextureCoords()->fName, atlasSizeInvName,
                                  &uv, &texIdx, nullptr);