Make the Flip suppression more generic to cover mac too.

tools/valgrind/memcheck/suppressions.txt

 # There are three 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 # running overnight and removing outdated bugs/suppressions.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 1807 matching lines @@
 {
    bug_28824
    Memcheck:Leak
    fun:_Znw*
    ...
    fun:_ZN7Profile13CreateProfileERK8FilePath
    fun:_ZN14ProfileManager13CreateProfileERK8FilePath
    fun:_ZN37ProfileManagerTest_CreateProfile_Test8TestBodyEv
 }
 {
    bug_29026

[jamesr, 2009/12/01 00:11:51]

29026 was merged into 29004, could you change that as well?

    Memcheck:Leak
    fun:_Znw*
-   fun:_ZN3net129_GLOBAL__N__b_slave_chromium_rel_linux_valgrind_builder_build_src_net_flip_flip_network_transaction_unittest.cc_00000000_DB93990219SessionDependenciesC1Ev
+   ...
    fun:_ZN3net26FlipNetworkTransactionTest17TransactionHelperERKNS_15HttpRequestInfoEPNS_17DelayedSocketDataE
    fun:_ZN3net42FlipNetworkTransactionTest_WriteError_Test8TestBodyEv
    fun:_ZN7testing4Test3RunEv
    fun:_ZN7testing8internal12TestInfoImpl3RunEv
    fun:_ZN7testing8TestCase3RunEv
    fun:_ZN7testing8internal12UnitTestImpl11RunAllTestsEv
    fun:_ZN7testing8UnitTest3RunEv
    fun:_ZN9TestSuite3RunEv
    fun:main
 }
 }