Suppress a memory leak in the gtk omnibox

tools/valgrind/memcheck/suppressions.txt

Index: tools/valgrind/memcheck/suppressions.txt
diff --git a/tools/valgrind/memcheck/suppressions.txt b/tools/valgrind/memcheck/suppressions.txt
index a72f9c311d2e8a3610eb89c29ca3db5b24f4b31b..383000a0e04b6ca2b5e1969f7ffd82bcf8e5a63b 100644
--- a/tools/valgrind/memcheck/suppressions.txt
+++ b/tools/valgrind/memcheck/suppressions.txt
@@ -3183,3 +3183,17 @@
    fun:_ZN12_GLOBAL__N_141FormStructureTest_EncodeQueryRequest_Test8TestBodyEv
    fun:_ZN7testingL35HandleExceptionsInMethodIfSupportedINS_4TestEvEET0_PT_MS3_FS2_vEPKc
 }
+{
+   bug_61685
+   Memcheck:Leak
+   fun:malloc
+   ...
+   fun:gtk_text_buffer_select_range
+   fun:_ZN23AutocompleteEditViewGtk16SetSelectedRangeERKNS_9CharRangeE
+   fun:_ZN23AutocompleteEditViewGtk23SetTextAndSelectedRangeERKSbIwSt11char_traitsIwESaIwEERKNS_9CharRangeE
+   fun:_ZN23AutocompleteEditViewGtk24SetWindowTextAndCaretPosERKSbIwSt11char_traitsIwESaIwEEj
+   fun:_ZN21AutocompleteEditModel6RevertEv
+   fun:_ZN23AutocompleteEditViewGtk9RevertAllEv
+   fun:_ZN23AutocompleteEditViewGtk6UpdateEPK11TabContents
+   fun:_ZN15LocationBarView6UpdateEPK11TabContents
+}