Fix Valgrind errors that occurred during testing.

tools/heapcheck/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 # running overnight and removing outdated bugs/suppressions.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 1035 matching lines @@
    bug_60872
    Heapcheck:Leak
    fun:base::BaseTimer::Start
    fun:ReloadButtonGtk::OnClicked
    fun:ReloadButtonGtk::OnClickedThunk
    fun:g_closure_invoke
    fun:ReloadButtonGtkTest_*_Test::TestBody
    fun:testing::HandleExceptionsInMethodIfSupported
    fun:testing::Test::Run
 }
-{
-   bug_62943a
-   Heapcheck:Leak
-   ...
-   fun:FakeURLFetcherFactory::CreateURLFetcher
-   fun:URLFetcher::Create
-   fun:safe_browsing::ClientSideDetectionService::StartClientReportPhishingRequest
-   fun:*DispatchToMethod
-}
-{
-   bug_62943b
-   Heapcheck:Leak
-   fun:__gnu_cxx::new_allocator::allocate
-   fun:std::string::_Rep::_S_create
-   fun:std::string::_S_construct
-   fun:std::string::_S_construct_aux
-   fun:std::string::_S_construct
-   fun:basic_string
-   ...
-   fun:safe_browsing::ClientSideDetectionServiceTest_SendClientReportPhishingRequest_Test::TestBody
-}
-{
-   bug_62943c
-   Heapcheck:Leak
-   fun:__gnu_cxx::new_allocator::allocate
-   fun:std::string::_Rep::_S_create
-   fun:std::string::_Rep::_M_clone
-   fun:std::string::_Rep::_M_grab
-   fun:std::string::assign
-   fun:std::string::operator=
-   fun:URLFetcher::set_upload_data
-   fun:safe_browsing::ClientSideDetectionService::StartClientReportPhishingRequest
-}
-{
-   bug_62943d
-   Heapcheck:Leak
-   fun:__gnu_cxx::new_allocator::allocate
-   fun:std::string::_Rep::_S_create
-   fun:std::string::_Rep::_M_clone
-   fun:std::string::reserve
-   fun:bool ::InitCanonical
-   fun:GURL
-   fun:safe_browsing::ClientSideDetectionService::StartClientReportPhishingRequest
-}
-{
-   bug_62943e
-   Heapcheck:Leak
-   fun:__gnu_cxx::new_allocator::allocate
-   fun:std::string::_Rep::_S_create
-   fun:std::string::_Rep::_M_clone
-   fun:std::string::_Rep::_M_grab
-   fun:basic_string
-   fun:FakeURLFetcherFactory::SetFakeResponse
-   fun:safe_browsing::ClientSideDetectionServiceTest::SetClientReportPhishingResponse
-}