Update gl2.h and update entry points.

Some method signatures were updated. Types like GLclampf and GLvoid
were replaced with other equivalents.

BUG=angleproject:1309

Change-Id: I05e8e2072c5a063d87ad96a855b907424661e680
Reviewed-on: https://chromium-review.googlesource.com/475011
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
diff --git a/src/tests/gl_tests/IndexedPointsTest.cpp b/src/tests/gl_tests/IndexedPointsTest.cpp
index c3779ef..980faaa 100644
--- a/src/tests/gl_tests/IndexedPointsTest.cpp
+++ b/src/tests/gl_tests/IndexedPointsTest.cpp
@@ -156,7 +156,7 @@
             GLint vertexColorLocation = glGetAttribLocation(program, "color");
             glVertexAttribPointer(vertexColorLocation, 3, GL_FLOAT, GL_FALSE,
                                   static_cast<const GLsizei>(VertexWithColorSize),
-                                  (GLvoid *)((sizeof(float) * 2)));
+                                  (void *)((sizeof(float) * 2)));
             glEnableVertexAttribArray(vertexColorLocation);
         }
         else