Replace Error(GL_NO_ERROR) with NoError().

In order to make the errors be consistent throughout ANGLE.

BUG=angleproject:1686

Change-Id: I0a2d86091d640aedeac94beae345c1fb6971b00d
Reviewed-on: https://chromium-review.googlesource.com/424835
Commit-Queue: Yunchao He <yunchao.he@intel.com>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
diff --git a/src/libANGLE/Image.cpp b/src/libANGLE/Image.cpp
index 828f862..718480b 100644
--- a/src/libANGLE/Image.cpp
+++ b/src/libANGLE/Image.cpp
@@ -65,7 +65,7 @@
         mSourcesOf.clear();
     }
 
-    return gl::Error(GL_NO_ERROR);
+    return gl::NoError();
 }
 
 void ImageSibling::addImageSource(egl::Image *imageSource)