Always use Desktop GL 4.1 or less BindBufferRange behavior.

gpu/command_buffer/service/indexed_buffer_binding_host.h

Index: gpu/command_buffer/service/indexed_buffer_binding_host.h
diff --git a/gpu/command_buffer/service/indexed_buffer_binding_host.h b/gpu/command_buffer/service/indexed_buffer_binding_host.h
index 3730069917f2a1ff176c102eef7f1d5281e463b1..363f75fc70d4dd1f6b89048de0e86dfe9c80448f 100644
--- a/gpu/command_buffer/service/indexed_buffer_binding_host.h
+++ b/gpu/command_buffer/service/indexed_buffer_binding_host.h
@@ -22,7 +22,9 @@ class Buffer;
 class GPU_EXPORT IndexedBufferBindingHost :
     public base::RefCounted<IndexedBufferBindingHost> {
  public:
-  // |needs_emulation| is set to true on Desktop GL 4.1 or lower.
+  // In theory |needs_emulation| needs to be true on Desktop GL 4.1 or lower.
+  // However, we set it to true everywhere, not to trust drivers to handle
+  // out-of-bounds buffer accesses.
   IndexedBufferBindingHost(uint32_t max_bindings, bool needs_emulation);
 
   // The following two functions do state update and call the underlying GL
@@ -89,7 +91,7 @@ class GPU_EXPORT IndexedBufferBindingHost :
     void Reset();
   };
 
-  // This is called on Desktop GL lower than 4.2, where the range
+  // This is called when |needs_emulation_| is true, where the range
   // (offset + size) can't go beyond the buffer's size.
   static void DoAdjustedBindBufferRange(
       GLenum target, GLuint index, GLuint service_id, GLintptr offset,