Suppress valgrind report.

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 # running overnight and removing outdated bugs/suppressions.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 6218 matching lines @@
    fun:_Znw*
    fun:_ZN20data_reduction_proxy69DataReductionProxyUsageStatsTest_isDataReductionProxyUnreachable_Test8TestBodyEv
 }
 {
    bug_390108
    Memcheck:Leak
    fun:_Zna*
    fun:_ZN3url17AddStandardSchemeEPKc
    fun:_ZN36AutocompleteInputTest_InputType_Test8TestBodyEv
 }
+{
+   bug_390500a
+   Memcheck:Uninitialized
+   ...
+   fun:_ZN14message_center22MessagePopupCollection13UpdateWidgetsEv
+   fun:_ZN14message_center22MessagePopupCollection18DoUpdateIfPossibleEv
+}
+{
+   bug_390500b
+   Memcheck:Uninitialized
+   ...
+   fun:_ZN14message_center22MessagePopupCollection17RepositionWidgetsEv
+   fun:_ZN14message_center22MessagePopupCollection18DoUpdateIfPossibleEv
+}
+
+{
+   bug_390500c
+   Memcheck:Uninitialized
+   ...
+   fun:_ZN14message_center22MessagePopupCollection17RepositionWidgetsEv
+   fun:_ZN14message_center22MessagePopupCollection14SetDisplayInfoERKN3gfx4RectES4_
+}