Move GrGLExtensions from GrGLContextInfo to GrGLInterface

src/gpu/gl/SkGLContextHelper.cpp

Index: src/gpu/gl/SkGLContextHelper.cpp
diff --git a/src/gpu/gl/SkGLContextHelper.cpp b/src/gpu/gl/SkGLContextHelper.cpp
index 4d314870ae240fa0a3eb0714c7f66ff309a6e10b..b06f755f677196bfabd5fcd58dda6a213cda665d 100644
--- a/src/gpu/gl/SkGLContextHelper.cpp
+++ b/src/gpu/gl/SkGLContextHelper.cpp
@@ -37,7 +37,7 @@ bool SkGLContextHelper::init(int width, int height) {
     if (fGL) {
         const GrGLubyte* temp;
 
-        if (!fGL->validate() || !fExtensions.init(fGL)) {
+        if (!fGL->validate()) {
             fGL = NULL;
             this->destroyGLContext();
             return false;