Revert of Fix ReadPixels from float fbo buffer in ES2/WebGL1.

ui/gl/gl_implementation.cc

Index: ui/gl/gl_implementation.cc
diff --git a/ui/gl/gl_implementation.cc b/ui/gl/gl_implementation.cc
index 9c9289f17a80dd9d28725f1dae67fa70ab506ffc..dfb1548ba8c4d69e22f812deffd6a62c72f7ed16 100644
--- a/ui/gl/gl_implementation.cc
+++ b/ui/gl/gl_implementation.cc
@@ -205,10 +205,9 @@
   const char* version_str =
       reinterpret_cast<const char*>(glGetString(GL_VERSION));
   unsigned major_version, minor_version;
-  bool is_es, is_es2, is_es3;
+  bool is_es, is_es3;
   gfx::GLVersionInfo::ParseVersionString(
-      version_str, &major_version, &minor_version,
-      &is_es, &is_es2, &is_es3);
+      version_str, &major_version, &minor_version, &is_es, &is_es3);
   return is_es || major_version < 3;
 }