Fix WebGL getParameter bug in command buffer.

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index ec09fd9d4deeb2db95d2773feaa2c246892f3b88..2a95dc9c5a3f5f7ed3c59a6938e1b2029e6d061b 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -2459,10 +2459,7 @@ bool GLES2DecoderImpl::GetHelper(
       return true;
     default:
       *num_written = util_.GLGetNumValuesReturned(pname);
-      if (params) {
-        glGetIntegerv(pname, params);
-      }
-      return true;
+      return false;
   }
 }