Remove precision from GrGLSLVaryingHandler

(It's built into the types now.)

Bug: skia:
Change-Id: I44edc6e71098cf74387091903e920b1dd929b103
Reviewed-on: https://skia-review.googlesource.com/59880
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
diff --git a/src/gpu/ops/GrTextureOp.cpp b/src/gpu/ops/GrTextureOp.cpp
index 133c2fd..291b199 100644
--- a/src/gpu/ops/GrTextureOp.cpp
+++ b/src/gpu/ops/GrTextureOp.cpp
@@ -118,8 +118,8 @@
                                                                   args.fOutputColor);
                 }
                 args.fFragBuilder->codeAppend("float2 texCoord;");
-                args.fVaryingHandler->addPassThroughAttribute(&textureGP.fTextureCoords, "texCoord",
-                                                              kHigh_GrSLPrecision);
+                args.fVaryingHandler->addPassThroughAttribute(&textureGP.fTextureCoords,
+                                                              "texCoord");
                 if (textureGP.numTextureSamplers() > 1) {
                     SkASSERT(args.fShaderCaps->integerSupport());
                     args.fFragBuilder->codeAppend("int texIdx;");