Rename ExtensionsService to ExtensionService.

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 # running overnight and removing outdated bugs/suppressions.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 843 matching lines @@
 }
 {
    bug_52900_c
    Heapcheck:Leak
    ...
    fun:IPC::TestSink::OnMessageReceived
    fun:MockRenderProcessHost::Send
    fun:PurgePluginListCache
    fun:PluginService::Observe
    fun:NotificationService::Notify
-   fun:ExtensionsService::NotifyExtensionLoaded
-   fun:ExtensionsService::OnExtensionLoaded
-   fun:ExtensionsService::LoadInstalledExtension
-   fun:ExtensionsService::ContinueLoadAllExtensions
-   fun:ExtensionsService::LoadAllExtensions
-   fun:ExtensionsService::Init
-   fun:ExtensionsServiceTest_CleanupOnStartup_Test::TestBody
+   fun:ExtensionService::NotifyExtensionLoaded
+   fun:ExtensionService::OnExtensionLoaded
+   fun:ExtensionService::LoadInstalledExtension
+   fun:ExtensionService::ContinueLoadAllExtensions
+   fun:ExtensionService::LoadAllExtensions
+   fun:ExtensionService::Init
+   fun:ExtensionServiceTest_CleanupOnStartup_Test::TestBody
 }
 {
    bug_53184
    Heapcheck:Leak
    fun:base::WaitableEventWatcher::StartWatching
    fun:IPC::SyncChannel::SyncContext::OnChannelOpened
    fun:*DispatchToMethod
    fun:RunnableMethod::Run
    fun:MessageLoop::RunTask
 }
@@ skipping 236 matching lines @@
    bug_66054_b
    Heapcheck:Leak
    fun:policy::AsynchronousPolicyTestBase_ProviderRefresh_Test::TestBody
 }
 {
    bug_66227
    Heapcheck:Leak
    ...
    fun:MalwareDetailsTest_*
 }