Remove Mac-only suppression in ExtensionPrefStoreTest, now fixed....

tools/valgrind/memcheck/suppressions_mac.txt

 # There are three kinds of suppressions in this file:
 # 1. Third party stuff we have no control over.
 #
 # 2. Intentional unit test errors, 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.
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 1354 matching lines @@
    fun:rips_f_DrawRing
    fun:rips_f_BltShape
    fun:ripc_Render
    fun:ripc_DrawRects
    fun:CGContextFillRects
    fun:CGContextFillRect
    fun:NSRectFill
    fun:_ZN18FocusIndicationFix40currentOSHasSetFocusRingStyleInBitmapBugEv
 }
 {
-   bug_48980_mac
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZNSt8_Rb_treeIPN11PrefService10PreferenceES2_St9_IdentityIS2_ENS0_24PreferencePathComparatorESaIS2_EE9_M_insertEPSt18_Rb_tree_node_baseS9_RKS2_
-   fun:_ZNSt8_Rb_treeIPN11PrefService10PreferenceES2_St9_IdentityIS2_ENS0_24PreferencePathComparatorESaIS2_EE13insert_uniqueERKS2_
-   fun:_ZNSt3setIPN11PrefService10PreferenceENS0_24PreferencePathComparatorESaIS2_EE6insertERKS2_
-   fun:_ZN11PrefService18RegisterPreferenceEPNS_10PreferenceE
-   fun:_ZN44ExtensionPrefStoreTest_NotifyWhenNeeded_Test8TestBodyEv
-}
-{
    bug_49250_a
    Memcheck:Cond
    fun:gleUpdateFogData
    fun:gleUpdateState
    fun:_ZN8remoting11CapturerMac12CaptureRectsERKSt6vectorIN3gfx4RectESaIS3_EEP14CallbackRunnerI6Tuple1I13scoped_refptrINS_8Capturer11CaptureDataEEEE
    fun:_ZN8remoting8Capturer19CaptureInvalidRectsEP14CallbackRunnerI6Tuple1I13scoped_refptrINS0_11CaptureDataEEEE
    fun:_ZN8remoting28CapturerMacTest_Capture_Test8TestBodyEv
 }
 {
    bug_49250_b
@@ skipping 99 matching lines @@
 {
    bug_49750
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN16CookiesTreeModelC2EPN3net13CookieMonsterEP26BrowsingDataDatabaseHelperP30BrowsingDataLocalStorageHelperP26BrowsingDataAppCacheHelper
    fun:_ZN26TabSpecificContentSettings27LocalSharedObjectsContainer19GetCookiesTreeModelEv
    fun:-[CollectedCookiesWindowController loadTreeModelFromTabContents]
    fun:-[CollectedCookiesWindowController initWithTabContents:]
    fun:_ZN12_GLOBAL__N_154CollectedCookiesWindowControllerTest_Construction_Test8TestBodyEv
 }