Rename gl::FenceSync to gl::Sync.

The spec refers to Sync objects, FenceSyncs being a subtype. The
motivation for this fix is to clear up the FenceSync_ entry point for
auto-generation.

BUG=angleproject:1309

Change-Id: I94c440476d701628575e7a3eea68b6dd110f41c3
Reviewed-on: https://chromium-review.googlesource.com/636516
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
diff --git a/src/libANGLE/queryutils.cpp b/src/libANGLE/queryutils.cpp
index ea13061..46bc656 100644
--- a/src/libANGLE/queryutils.cpp
+++ b/src/libANGLE/queryutils.cpp
@@ -998,11 +998,7 @@
     }
 }
 
-Error QuerySynciv(const FenceSync *sync,
-                  GLenum pname,
-                  GLsizei bufSize,
-                  GLsizei *length,
-                  GLint *values)
+Error QuerySynciv(const Sync *sync, GLenum pname, GLsizei bufSize, GLsizei *length, GLint *values)
 {
     ASSERT(sync);