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/Context.cpp b/src/libANGLE/Context.cpp
index 3bb107a..aceddb5 100644
--- a/src/libANGLE/Context.cpp
+++ b/src/libANGLE/Context.cpp
@@ -1095,7 +1095,7 @@
     // set query as active for specified target only if begin succeeded
     mGLState.setActiveQuery(target, queryObject);
 
-    return Error(GL_NO_ERROR);
+    return NoError();
 }
 
 Error Context::endQuery(GLenum target)