Revert r118525 / Re-land r118240 - the build failure was a flake.

third_party/khronos/GLES2/gl2ext.h

 #ifndef __gl2ext_h_
 #define __gl2ext_h_
 
 /* $Revision: 15049 $ on $Date:: 2011-07-06 17:28:16 -0700 #$ */
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 /*
@@ skipping 1380 matching lines @@
 #define GL_CHROMIUM_texture_compression_dxt5 1
 #define GL_COMPRESSED_RGBA_S3TC_DXT5_EXT  0x83F3
 #endif
 
 /* GL_CHROMIUM_enable_feature */
 #ifndef GL_CHROMIUM_enable_feature
 #define GL_CHROMIUM_enable_feature 1
 #ifdef GL_GLEXT_PROTOTYPES
 #define glEnableFeatureCHROMIUM GLES2_GET_FUN(EnableFeatureCHROMIUM)
 #if !defined(GLES2_USE_CPP_BINDINGS)
-GL_APICALL void GL_APIENTRY glEnableFeatureCHROMIUM (const GLchar *feature);
+GL_APICALL GLboolean GL_APIENTRY glEnableFeatureCHROMIUM (const GLchar *feature);
 #endif
 #else
 typedef void (GL_APIENTRYP PFNGLENABLEFEATURECHROMIUM) (const GLchar *feature);
 #endif
 #endif
 
 /* GL_CHROMIUM_post_sub_buffer */
 /* This extension is modeled after EGL_NV_post_sub_buffer and
  * GLX_MESA_copy_sub_buffer. It's like a SwapBuffers, but it pushes a region
  * of the back buffer to the front buffer.
@@ skipping 88 matching lines @@
 #else
 typedef void (GL_APIENTRYP PFNGLTEXIMAGEIOSURFACE2DCHROMIUM) (GLenum target, GLsizei width, GLsizei height, GLuint ioSurfaceId, GLuint plane);
 #endif
 #endif
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif /* __gl2ext_h_ */