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/libANGLE/renderer/null/ContextNULL.cpp b/src/libANGLE/renderer/null/ContextNULL.cpp
index d6fba6f..a07fb5d 100644
--- a/src/libANGLE/renderer/null/ContextNULL.cpp
+++ b/src/libANGLE/renderer/null/ContextNULL.cpp
@@ -108,7 +108,7 @@
 gl::Error ContextNULL::drawElements(GLenum mode,
                                     GLsizei count,
                                     GLenum type,
-                                    const GLvoid *indices,
+                                    const void *indices,
                                     const gl::IndexRange &indexRange)
 {
     return gl::NoError();
@@ -117,7 +117,7 @@
 gl::Error ContextNULL::drawElementsInstanced(GLenum mode,
                                              GLsizei count,
                                              GLenum type,
-                                             const GLvoid *indices,
+                                             const void *indices,
                                              GLsizei instances,
                                              const gl::IndexRange &indexRange)
 {
@@ -129,18 +129,18 @@
                                          GLuint end,
                                          GLsizei count,
                                          GLenum type,
-                                         const GLvoid *indices,
+                                         const void *indices,
                                          const gl::IndexRange &indexRange)
 {
     return gl::NoError();
 }
 
-gl::Error ContextNULL::drawArraysIndirect(GLenum mode, const GLvoid *indirect)
+gl::Error ContextNULL::drawArraysIndirect(GLenum mode, const void *indirect)
 {
     return gl::NoError();
 }
 
-gl::Error ContextNULL::drawElementsIndirect(GLenum mode, GLenum type, const GLvoid *indirect)
+gl::Error ContextNULL::drawElementsIndirect(GLenum mode, GLenum type, const void *indirect)
 {
     return gl::NoError();
 }