Valgrind Mac: Restore a couple suppressions that are still active.

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 # running overnight and removing outdated bugs/suppressions.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 76 matching lines @@
    Memcheck:Leak
    fun:_Znw*
    fun:_ZNK11AEEventImpl9duplicateEv
    fun:AESendMessage
    fun:_ZL35HIToolboxLSNotificationCallbackFunc18LSNotificationCodedPKvPK7__LSASNS1_11LSSessionIDS1_
    fun:_ZL48LSScheduleNotificationReceiveMessageCallbackFuncP12__CFMachPortPvlS1_
    fun:__CFMachPortPerform
    fun:__CFRunLoopRun
    ...
 }
+# Intentional leaks in AppKit, for an OS-level cache. Only appear on the first
+# run of each reboot.  See also issues 105525, 257276, 340847.
+{
+   bug_257276_b
+   Memcheck:Leak
+   fun:malloc_zone_malloc
+   ...
+   fun:setCursorFromBundle
+   fun:CoreCursorSet
+   fun:-[NSCursor set]
+}
 
 # 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.
 {
    # Mac Sandbox test cases are registered in a global map.  This code is only
    # used in the unit test binary.
    Mac_Sandbox_Intentional_Leak1
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN7content8internal19RegisterSandboxTestINS_*
@@ skipping 48 matching lines @@
 {
    bug_159190
    Memcheck:Uninitialized
    ...
    fun:_ZNK19TConcreteFontScaler15CopyGlyphBitmapEtjP6CGRectPm
    ...
    fun:_ZN9Offscreen5getCGERK19SkScalerContext_MacRK7SkGlyphtPmb
    fun:_ZN19SkScalerContext_Mac13generateImageERK7SkGlyph
 }
 {
+   bug_173779
+   Memcheck:Uninitialized
+   ...
+   fun:img_data_lock
+   fun:CGSImageDataLock
+   fun:ripc_AcquireImage
+   fun:ripc_DrawImage*
+   fun:CGContextDrawImage*
+   ...
+   fun:_ZN11CUIRenderer4DrawE6CGRectP9CGContextPK14__CFDictionaryPS5_
+}
+{
   bug_340726
   Memcheck:Leak
   fun:_Znw*
   fun:_ZN4base17LoadNativeLibrary*
   fun:_ZN3gfx26InitializeStaticGLBindings*
   fun:_ZN3gfx9GLSurface30InitializeOneOffImplementation*
   fun:_ZN3gfx9GLSurface24InitializeOneOffForTestsEv
 }
 {
    bug_380568
@@ skipping 33 matching lines @@
    fun:_ZNSt3mapIPKN15tracked_objects6BirthsENS0_9DeathDataESt4lessIS3_ESaISt4pairIKS3_S4_EEE6insertESt17_Rb_tree_iteratorIS9_ERKS9_
    fun:_ZNSt3mapIPKN15tracked_objects6BirthsENS0_9DeathDataESt4lessIS3_ESaISt4pairIKS3_S4_EEEixERS8_
    fun:_ZN15tracked_objects10ThreadData11TallyADeathERKNS_6BirthsEiRKNS_13TaskStopwatchE
    fun:_ZN15tracked_objects10ThreadData31TallyRunOnNamedThreadIfTrackingERKN4base12TrackingInfoERKNS_13TaskStopwatchE
    fun:_ZN4base5debug13TaskAnnotator7RunTaskEPKcS3_RKNS_11PendingTaskE
    fun:_ZN4base11MessageLoop7RunTaskERKNS_11PendingTaskE
    fun:_ZN4base11MessageLoop21DeferOrRunPendingTaskERKNS_11PendingTaskE
    fun:_ZN4base11MessageLoop6DoWorkEv
 }