Suppresses the memory errors for Bug 91771.

This change suppresses the uninitialized-variable-used errors in sync_ui_util::ConstructAboutInformation() caused probably by r95536 <http://crrev.com/95536>.

TBR=timurrrr,glider,thestig
BUG=91771
TEST=make the "Linux Tests (valgrind)(6)" bot greener.
Review URL: http://codereview.chromium.org/7582001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@95559 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/memcheck/suppressions.txt

@@ -5183,6 +5183,20 @@
    fun:_Znw*
    fun:_ZN16CrxUpdateService19ProcessPendingItemsEv
 }
+{
+   bug_91771_a
+   Memcheck:Value4
+   ...
+   fun:_ZN12sync_ui_util25ConstructAboutInformationEP18ProfileSyncServicePN4base15DictionaryValueE
+   fun:_ZN71SyncUIUtilTest_ConstructAboutInformationWithUnrecoverableErrorTest_Test8TestBodyEv
+}
+{
+   bug_91771_b
+   Memcheck:Cond
+   ...
+   fun:_ZN12sync_ui_util25ConstructAboutInformationEP18ProfileSyncServicePN4base15DictionaryValueE
+   fun:_ZN71SyncUIUtilTest_ConstructAboutInformationWithUnrecoverableErrorTest_Test8TestBodyEv
+}
 
 #-----------------------------------------------------------------------
 # These only occur on our Google workstations