Make dynamic mock bindings initialization consistent with other GL implementations

ui/gl/gl_implementation.h

Index: ui/gl/gl_implementation.h
diff --git a/ui/gl/gl_implementation.h b/ui/gl/gl_implementation.h
index 53e9600df1b6093146b5076361b7a27983ddda73..cf03b6196e469aa211ec2e42f9dd6e299f9e5cae 100644
--- a/ui/gl/gl_implementation.h
+++ b/ui/gl/gl_implementation.h
@@ -46,11 +46,6 @@ typedef void* (WINAPI *GLGetProcAddressProc)(const char* name);
 typedef void* (*GLGetProcAddressProc)(const char* name);
 #endif
 
-// Initialize function bindings that depend on the context for a GL
-// implementation.
-GL_EXPORT bool InitializeDynamicGLBindings(GLImplementation implementation,
-                                           GLContext* context);
-
 // Initialize stub methods for drawing operations in the GL bindings. The
 // null draw bindings default to enabled, so that draw operations do nothing.
 GL_EXPORT void InitializeNullDrawGLBindings();