Remove old GR_* GL extension defines

gpu/include/GrGLConfig.h

Index: gpu/include/GrGLConfig.h
===================================================================
--- gpu/include/GrGLConfig.h	(revision 969)
+++ gpu/include/GrGLConfig.h	(working copy)
@@ -99,50 +99,12 @@
 // Windows where we match GDI's order).
 #ifndef GR_GL_32BPP_COLOR_FORMAT
     #if GR_WIN32_BUILD
-        #define GR_GL_32BPP_COLOR_FORMAT    GR_BGRA //use GR prefix because this
-    #else                                           //may be an extension.
+        #define GR_GL_32BPP_COLOR_FORMAT    GR_GL_BGRA
+    #else
         #define GR_GL_32BPP_COLOR_FORMAT    GR_GL_RGBA
     #endif
 #endif
 
-
-
-// BGRA format
-#define GR_BGRA                     0x80E1
-
-// FBO / stencil formats
-#define GR_FRAMEBUFFER              0x8D40
-#define GR_FRAMEBUFFER_COMPLETE     0x8CD5
-#define GR_COLOR_ATTACHMENT0        0x8CE0
-#define GR_FRAMEBUFFER_BINDING      0x8CA6
-#define GR_RENDERBUFFER             0x8D41
-#define GR_STENCIL_ATTACHMENT       0x8D20
-#define GR_STENCIL_INDEX4           0x8D47
-#define GR_STENCIL_INDEX8           0x8D48
-#define GR_STENCIL_INDEX16          0x8D49
-#define GR_DEPTH24_STENCIL8         0x88F0
-#define GR_MAX_RENDERBUFFER_SIZE    0x84E8
-#define GR_DEPTH_STENCIL_ATTACHMENT 0x821A
-#define GR_DEPTH_STENCIL            0x84F9
-#define GR_RGBA8                    0x8058
-#define GR_RGB565                   0x8D62
-
-
-// Multisampling
-
-// IMG MAX_SAMPLES uses a different value than desktop, Apple ES extension.
-#define GR_MAX_SAMPLES              0x8D57
-#define GR_MAX_SAMPLES_IMG          0x9135
-#define GR_READ_FRAMEBUFFER         0x8CA8
-#define GR_DRAW_FRAMEBUFFER         0x8CA9
-
-// Buffer mapping
-#define GR_WRITE_ONLY               0x88B9
-#define GR_BUFFER_MAPPED            0x88BC
-
-// Palette texture
-#define GR_PALETTE8_RGBA8           0x8B91
-
 ////////////////////////////////////////////////////////////////////////////////
 
 extern void GrGLCheckErr(const char* location, const char* call);