Revert 181828, CL introducing leaks was reverted in 181831.

tools/valgrind/memcheck/suppressions.txt

 # There are four 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 # running overnight and removing outdated bugs/suppressions.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 6512 matching lines @@
    fun:_ZN20OneClickSigninHelper14DidStopLoadingEPN7content14RenderViewHostE
    fun:_ZN67OneClickSigninHelperTest_SigninFromWebstoreWithConfigSyncfirst_Test8TestBodyEv
 }
 {
    bug_175428:
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN22AutocompleteControllerC1EP7ProfileP30AutocompleteControllerDelegatei
    fun:_ZN24AutocompleteProviderTest32ResetControllerWithTestProvidersEbPP12TestProviderS2_
 }
-{
-   bug_175644_a
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZN5views12_GLOBAL__N_132TabbedPaneTest_AddAndSelect_Test8TestBodyEv
-}
-{
-   bug_175644_b
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZN5views18FocusTraversalTest15InitContentViewEv
-   fun:_ZN5views16FocusManagerTest5SetUpEv
-}
-{
-   bug_175644_c
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZN5views12_GLOBAL__N_133TabbedPaneTest_SizeAndLayout_Test8TestBodyEv
-}