Leak in BrowserMainPartsPosix::PostMainMessageLoopStart

Suppresses leak in BrowserMainPartsPosix::PostMainMessageLoopStart

BUG=29675
TEST=Run Valgrind on Chrome OS
R=willchan@chromium.org

Review URL: https://chromiumcodereview.appspot.com/9572017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@124688 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/memcheck/suppressions.txt

@@ -1641,8 +1641,8 @@
    fun:_Znw*
    fun:_ZN27ChromeBrowserMainPartsPosix24PostMainMessageLoopStartEv
    ...
-   fun:_ZN7content16BrowserMainParts20MainMessageLoopStartEv
-   fun:_Z11BrowserMainRK18MainFunctionParams
+   fun:_ZN7content11ContentMainEiPPKcPNS_19ContentMainDelegateE
+   fun:ChromeMain
 }
 {
    bug_30346