Fix obvious leak in chrome_web_ui_data_source_unittest.cc, and revert associated suppresions.

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 # running overnight and removing outdated bugs/suppressions.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 4794 matching lines @@
    fun:_ZN8chromeos12input_method18InputMethodManager11GetInstanceEv
 }
 {
    bug_87998
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN33GeolocationInfoBarQueueController17ShowQueuedInfoBarEii
    fun:_ZN33GeolocationInfoBarQueueController20CreateInfoBarRequestEiiiRK4GURLS2_
    fun:_ZN34ChromeGeolocationPermissionContext28RequestGeolocationPermissionEiiiRK4GURL
 }
-{
-   bug_88094_a
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZN25ChromeWebUIDataSourceTest5SetUpEv
-}
-{
-   bug_88094_b
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZN9__gnu_cxx13new_allocatorISt13_Rb_tree_nodeISt4pairIKSsP5ValueEEE8allocateEmPKv
-   fun:_ZNSt8_Rb_treeISsSt4pairIKSsP5ValueESt10_Select1stIS4_ESt4lessISsESaIS4_EE11_M_get_nodeEv
-   ...
-   fun:_ZN20ChromeURLDataManager10DataSource23SetFontAndTextDirectionEP15DictionaryValue
-   fun:_ZN21ChromeWebUIDataSource26SendLocalizedStringsAsJSONEi
-   fun:_ZN21ChromeWebUIDataSource16StartDataRequestERKSsbi
-}
-{
-   bug_88094_c
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZN9__gnu_cxx13new_allocatorISt13_Rb_tree_nodeISt4pairIKSsP5ValueEEE8allocateEjPKv
-   fun:_ZNSt8_Rb_treeISsSt4pairIKSsP5ValueESt10_Select1stIS4_ESt4lessISsESaIS4_EE11_M_get_nodeEv
-   ...
-   fun:_ZN15DictionaryValue23SetWithoutPathExpansionERKSsP5Value
-   fun:_ZN15DictionaryValue3SetERKSsP5Value
-   fun:_ZN15DictionaryValue9SetStringERKSsRKSbItN4base20string16_char_traitsESaItEE
-   fun:_ZN20ChromeURLDataManager10DataSource23SetFontAndTextDirectionEP15DictionaryValue
-   fun:_ZN21ChromeWebUIDataSource26SendLocalizedStringsAsJSONEi
-   fun:_ZN21ChromeWebUIDataSource16StartDataRequestERKSsbi
-   fun:_ZN25MockChromeWebUIDataSource16StartDataRequestERKSsbi
-}
 
 #-----------------------------------------------------------------------
 # These only occur on our Google workstations
 {
    bug_todo_freeres
    Memcheck:Free
    fun:free
    fun:__libc_freeres
    fun:_vgnU_freeres
    fun:_Exit
@@ skipping 11 matching lines @@
 {
    bug_todo_getdelim2
    Memcheck:Leak
    fun:malloc
    fun:getdelim
    obj:/lib/libselinux.so.1
    obj:/lib/libselinux.so.1
    obj:/lib/libselinux.so.1
 }