Update khronos GLES2/gl2.h header

ui/gl/gl_bindings_skia_in_process.cc

Index: ui/gl/gl_bindings_skia_in_process.cc
diff --git a/ui/gl/gl_bindings_skia_in_process.cc b/ui/gl/gl_bindings_skia_in_process.cc
index f45626616ed6ff8e8de0c59b25165e6b51f3668d..115eac8d8a57e7abc000935e20c8eb311cd404e8 100644
--- a/ui/gl/gl_bindings_skia_in_process.cc
+++ b/ui/gl/gl_bindings_skia_in_process.cc
@@ -365,7 +365,7 @@ GLvoid StubGLScissor(GLint x, GLint y, GLsizei width, GLsizei height) {
   glScissor(x, y, width, height);
 }
 
-GLvoid StubGLShaderSource(GLuint shader, GLsizei count, const char** str,
+GLvoid StubGLShaderSource(GLuint shader, GLsizei count, const char* const* str,
                           const GLint* length) {
   glShaderSource(shader, count, str, length);
 }