Update suppression for crbug.com/29675.

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 de96cbd75812d19d1405cca31faee07692bd5b7e..96f87b47e645dbb53f84d7fa05996fa54b313922 100644
--- a/tools/valgrind/memcheck/suppressions.txt
+++ b/tools/valgrind/memcheck/suppressions.txt
@@ -2038,6 +2038,8 @@
    bug_29675
    Memcheck:Leak
    fun:_Znw*
+   fun:_ZN21BrowserMainPartsPosix24PostMainMessageLoopStartEv
+   fun:_ZN16BrowserMainParts20MainMessageLoopStartEv
    fun:_Z11BrowserMainRK18MainFunctionParams
 }
 {
@@ -3481,15 +3483,6 @@
    fun:_ZN51AudioRendererHostTest_CreateLowLatencyAndClose_Test8TestBodyEv
 }
 {
-   bug_48998
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZN21BrowserMainPartsPosix16TemporaryPosix_1Ev
-   fun:_Z11BrowserMainRK18MainFunctionParams
-   fun:ChromeMain
-   fun:main
-}
-{
    bug_49262
    Memcheck:Leak
    fun:_Znw*