Make appending default precision be controled by GLSL

src/gpu/gl/GrGLGLSL.cpp

Index: src/gpu/gl/GrGLGLSL.cpp
diff --git a/src/gpu/gl/GrGLGLSL.cpp b/src/gpu/gl/GrGLGLSL.cpp
index 4d2bf9794baa43f7ef593f50cb0e0f292d05fbab..98a2386161f8c80827a070adc61a60eac48edc1b 100755
--- a/src/gpu/gl/GrGLGLSL.cpp
+++ b/src/gpu/gl/GrGLGLSL.cpp
@@ -48,21 +48,3 @@ bool GrGLGetGLSLGeneration(const GrGLInterface* gl, GrGLSLGeneration* generation
     }
 }
 
-void GrGLAppendGLSLDefaultFloatPrecisionDeclaration(GrSLPrecision p, GrGLStandard s, SkString* out) {
-    // Desktop GLSL has added precision qualifiers but they don't do anything.
-    if (kGLES_GrGLStandard == s) {
-        switch (p) {
-            case kHigh_GrSLPrecision:
-                out->append("precision highp float;\n");
-                break;
-            case kMedium_GrSLPrecision:
-                out->append("precision mediump float;\n");
-                break;
-            case kLow_GrSLPrecision:
-                out->append("precision lowp float;\n");
-                break;
-            default:
-                SkFAIL("Unknown precision value.");
-        }
-    }
-}