Suppress gtk related leaks inside BrowserWidgetGtk::initWidgets

tools/valgrind/memcheck/suppressions.txt

 # There are four kinds of suppressions in this file.
 # 1. third party stuff we have no control over
 #
 # 2. intentional unit test errors, or stuff that is somehow a false positive
 # in our own code, or stuff that is so trivial it's not worth fixing
 #
 # 3. Suppressions for real chromium bugs that are not yet fixed.
 # These should all be in chromium's bug tracking system (but a few aren't yet).
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 6388 matching lines @@
    fun:_ZN4base19SequencedWorkerPool5Inner30FinishStartingAdditionalThreadEi
    fun:_ZN4base19SequencedWorkerPool5Inner10ThreadLoopEPNS0_6WorkerE
    fun:_ZN4base19SequencedWorkerPool6Worker3RunEv
    fun:_ZN4base12SimpleThread10ThreadMainEv
    fun:_ZN4base12_GLOBAL__N_110ThreadFuncEPv
 }
 {
    bug_167175a
    Memcheck:Leak
    ...
-   fun:_ZN18LocationBarViewGtk4InitEb
-   fun:_ZN17BrowserToolbarGtk4InitEP10_GtkWindow
+   fun:g_*
+   ...
    fun:_ZN16BrowserWindowGtk11InitWidgetsEv
    fun:_ZN16BrowserWindowGtk4InitEv
    fun:_ZN13BrowserWindow19CreateBrowserWindowEP7Browser
 }
 {
    bug_167175b
    Memcheck:Leak
-   ...
-   fun:_ZN15BrowserTitlebar4InitEv
-   fun:_ZN16BrowserWindowGtk11InitWidgetsEv
-   fun:_ZN16BrowserWindowGtk4InitEv
-   fun:_ZN13BrowserWindow19CreateBrowserWindowEP7Browser
-}
-{
-   bug_167175c
-   Memcheck:Leak
    fun:malloc
    obj:/lib/libpng12.so.0.42.0
    fun:png_create_read_struct_2
    ...
    fun:_ZN15ReloadButtonGtkC1EP18LocationBarViewGtkP7Browser
    fun:_ZN17BrowserToolbarGtk4InitEP10_GtkWindow
    fun:_ZN16BrowserWindowGtk11InitWidgetsEv
    fun:_ZN16BrowserWindowGtk4InitEv
    fun:_ZN13BrowserWindow19CreateBrowserWindowEP7Browser
 }
@@ skipping 20 matching lines @@
 }
 {
    bug_167481b
    Memcheck:Uninitialized
    ...
    fun:encode_frame_to_data_rate
    fun:vp8_get_compressed_data
    fun:vp8e_encode
    fun:vpx_codec_encode
 }