Bug 15762 happens on Linux, too, so move suppression to generic file....

tools/valgrind/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 # running overnight and removing outdated bugs/suppressions.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 608 matching lines @@
    Memcheck:Leak
    fun:malloc
    fun:g_malloc
    ...
    fun:gtk_event_box_new
    fun:_ZN6TabGtkC1EPNS_11TabDelegateE
    fun:_ZN11TabStripGtk13TabInsertedAtEP11TabContentsib
    fun:_ZN13TabStripModel19InsertTabContentsAtEiP11TabContentsbb
 }
 {
+   bug_15762
+   Memcheck:Cond
+   fun:_ZN7testing8internal11CmpHelperEQIjjEENS_15AssertionResultEPKcS4_RKT_RKT0_
+   fun:_ZN7testing8internal8EqHelperILb0EE7CompareIjjEENS_15AssertionResultEPKcS6_RKT_RKT0_
+   fun:_ZN39ImageOperations_CreateMaskedBitmap_Test8TestBodyEv
+}
+{
    # very common in ui tests
    bug_16089
    Memcheck:Leak
    fun:*
    fun:_ZN4base22LinuxDynamicThreadPool8PostTaskEP4Task
    ...
    fun:_ZN3net12HostResolver3Job5StartEv
 }
 {
    # ditto, but tweaked to fire on bots, more robust against optimizer changes?
@@ skipping 233 matching lines @@
    Memcheck:Leak
    fun:_Znwj
    fun:_ZN10URLFetcherC1ERK4GURLNS_11RequestTypeEPNS_8DelegateE
    fun:_ZN22AlternateNavURLFetcher7ObserveE16NotificationTypeRK18NotificationSourceRK19NotificationDetails
    fun:_ZN19NotificationService6NotifyE16NotificationTypeRK18NotificationSourceRK19NotificationDetails
    fun:_ZN20NavigationController9LoadEntryEP15NavigationEntry
    fun:_ZN20NavigationController7LoadURLERK4GURLS2_j
    fun:_ZN7Browser14OpenURLAtIndexEP11TabContentsRK4GURLS4_21WindowOpenDispositionjib
    fun:_ZN7Browser14OpenCurrentURLEv
 }