Add MessageLoopProxy::current

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 # running overnight and removing outdated bugs/suppressions.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 1432 matching lines @@
 {
    bug_81575
    Heapcheck:Leak
    ...
    fun:Options
    fun:fileapi::FileSystemOriginDatabase::Init
 }
 {
    bug_81796_a
    Heapcheck:Leak
-   fun:base::MessageLoopProxy::CreateForCurrentThread
+   fun:base::MessageLoopProxy::current
    fun:*Context
    fun:*ChannelProxy
    fun:IPCChannelTest_ChannelProxyTest_Test::TestBody
 }
 {
    bug_81796_b
    Heapcheck:Leak
-   fun:base::MessageLoopProxy::CreateForCurrentThread
+   fun:base::MessageLoopProxy::current
    ...
    fun:*SyncContext
    fun:*SyncChannel
    fun:ChildThread::Init
 }
 {
    bug_82974a
    Heapcheck:Leak
    fun:sqlite3MemMalloc
    fun:net::X509Certificate::CreateOSCertHandleFromBytes
@@ skipping 240 matching lines @@
    fun:BrowserAccessibilityManagerTest_TestCreateEmptyDocument_Test::TestBody
 }
 {
    bug_91845_c
    Heapcheck:Leak
    ...
    fun:BrowserAccessibilityManager::Create
    fun:BrowserAccessibilityManager::CreateEmptyDocument
    fun:BrowserAccessibilityManagerTest_TestCreateEmptyDocument_Test::TestBody
 }