Leaks reported in disk_cache::BackendIO

Adds suppressions for leaks in disk_cache::BackendIO.

BUG=227301
TEST=Heapcheck goes green.
TBR=dsinclair@chromium.org

Review URL: https://codereview.chromium.org/13445008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@192687 0039d316-1c4b-4281-b951-d872f2087c98

tools/heapcheck/suppressions.txt

@@ -1829,3 +1829,26 @@
    fun:ScreenshotTaker::HandleTakePartialScreenshot
    fun:ash::test::ScreenshotTakerTest_TakeScreenshot_Test::TestBody
 }
+{
+   bug_227301a
+   Heapcheck:Leak
+   fun:base::internal::WeakReferenceOwner::GetRef
+   fun:base::WeakPtrFactory::GetWeakPtr
+   fun:disk_cache::InFlightBackendIO::GetWeakPtr
+   fun:disk_cache::BackendImpl::GetBackgroundQueue
+   fun:disk_cache::EntryImpl::OnEntryCreated
+   fun:disk_cache::BackendIO::OnDone
+   fun:disk_cache::InFlightBackendIO::OnOperationComplete
+   fun:disk_cache::InFlightIO::InvokeCallback
+   fun:disk_cache::BackgroundIO::OnIOSignalled
+}
+{
+   bug_227301b
+   Heapcheck:Leak
+   ...
+   fun:disk_cache::EntryImpl::PrepareTarget
+   fun:disk_cache::EntryImpl::InternalWriteData
+   fun:disk_cache::EntryImpl::WriteDataImpl
+   fun:disk_cache::BackendIO::ExecuteEntryOperation
+   fun:disk_cache::BackendIO::ExecuteOperation
+}