Fixed memory leaks in download manager unit tests.

tools/heapcheck/suppressions.txt

Index: tools/heapcheck/suppressions.txt
diff --git a/tools/heapcheck/suppressions.txt b/tools/heapcheck/suppressions.txt
index b44a4e067a2df960ee4943d6056467ae6550380b..ea4e48648e38b796fe6bdd86295c0874ccb59fd8 100644
--- a/tools/heapcheck/suppressions.txt
+++ b/tools/heapcheck/suppressions.txt
@@ -1610,52 +1610,3 @@
    fun:net::ClientSocketPoolManager::InitSocketHandleForRawConnect
    fun:notifier::ProxyResolvingClientSocket::ProcessProxyResolveDone
 }
-{
-   bug_83638a
-   Heapcheck:Leak
-   fun:DownloadManagerTest_*_Test::TestBody
-   fun:testing::internal::HandleSehExceptionsInMethodIfSupported
-   fun:testing::internal::HandleExceptionsInMethodIfSupported
-   fun:testing::Test::Run
-}
-{
-   bug_83638b
-   Heapcheck:Leak
-   fun:__gnu_cxx::new_allocator::allocate
-   fun:std::_Vector_base::_M_allocate
-   fun:std::vector::_M_insert_aux
-   fun:std::vector::push_back
-   fun:DownloadManagerTest_*_Test::TestBody
-   fun:testing::internal::HandleSehExceptionsInMethodIfSupported
-   fun:testing::internal::HandleExceptionsInMethodIfSupported
-   fun:testing::Test::Run
-}
-{
-   bug_83638c
-   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::GURL
-   fun:DownloadManagerTest_StartDownload_Test::TestBody
-   fun:testing::internal::HandleSehExceptionsInMethodIfSupported
-   fun:testing::internal::HandleExceptionsInMethodIfSupported
-   fun:testing::Test::Run
-}
-{
-   bug_83638d
-   Heapcheck:Leak
-   fun:__gnu_cxx::new_allocator::allocate
-   fun:std::string::_Rep::_S_create
-   fun:std::string::_M_mutate
-   fun:std::string::_M_replace_safe
-   fun:std::string::assign
-   fun:std::string::assign
-   fun:std::string::operator=
-   fun:DownloadManagerTest_StartDownload_Test::TestBody
-   fun:testing::internal::HandleSehExceptionsInMethodIfSupported
-   fun:testing::internal::HandleExceptionsInMethodIfSupported
-   fun:testing::Test::Run
-}