Revert of Add support for compressed GPU memory buffers.

ui/gl/gl_image_memory.h

Index: ui/gl/gl_image_memory.h
diff --git a/ui/gl/gl_image_memory.h b/ui/gl/gl_image_memory.h
index befc3a8e2889268e36c7f5c1d4f7d4c6756e467c..a50a38064b1574ad55f571bb76581e9922d9399f 100644
--- a/ui/gl/gl_image_memory.h
+++ b/ui/gl/gl_image_memory.h
@@ -25,9 +25,6 @@
   static bool StrideInBytes(size_t width,
                             gfx::GpuMemoryBuffer::Format format,
                             size_t* stride_in_bytes);
-
-  static bool ValidSize(const gfx::Size& size,
-                        gfx::GpuMemoryBuffer::Format format);
 
   bool Initialize(const unsigned char* memory,
                   gfx::GpuMemoryBuffer::Format format);