Revert of Move copy-surface-as-draw fallback to GrGLGpu.

src/gpu/gl/GrGLSL.cpp

Index: src/gpu/gl/GrGLSL.cpp
diff --git a/src/gpu/gl/GrGLSL.cpp b/src/gpu/gl/GrGLSL.cpp
index f4caf5201292ffbe837129d077fccbbc1d0586b1..d388d9120a1d3fc43891ba47a50f2f4221ddb432 100644
--- a/src/gpu/gl/GrGLSL.cpp
+++ b/src/gpu/gl/GrGLSL.cpp
@@ -91,25 +91,6 @@
     }
 }
 
-void GrGLSLAppendDefaultFloatPrecisionDeclaration(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.");
-        }
-    }
-}
-
 void GrGLSLMulVarBy4f(SkString* outAppend, const char* vec4VarName, const GrGLSLExpr4& mulFactor) {
     if (mulFactor.isOnes()) {
         *outAppend = SkString();