[MemSheriff] LayoutTests leak RenderProcessHostImpl

LayoutTests delete all but one RenderProcessHostImpl message. That
means we need to suppress all leaks below RenderProcessHostImpl::Init
if it happens in a layout test.

BUG=367809
TBR=thestig@chromium.org, yzshen@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/309613003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@273888 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/memcheck/suppressions.txt

@@ -6367,6 +6367,17 @@
    fun:_ZN4mojo9RemotePtrINS_11ShellClientEE5resetENS_16ScopedHandleBaseINS_15InterfaceHandleIS1_EEEEPNS_5ShellEPNS_12ErrorHandlerEP15MojoAsyncWaiter
    fun:_ZN7content19MojoApplicationHost4InitEv
 }
+{
+   bug_367809_d
+   Memcheck:Leak
+   fun:_Znw*
+   ...
+   fun:_ZN7content21RenderProcessHostImpl4InitEv
+   ...
+   fun:_ZN7content5Shell7LoadURLERK4GURL
+   fun:_ZN7content20WebKitTestController20PrepareForLayoutTestERK4GURLRKN4base8FilePathEbRKSs
+   fun:_ZN12_GLOBAL__N_110RunOneTestERKSsPbRK10scoped_ptrIN7content17BrowserMainRunnerEN4base14DefaultDeleterIS5_EEE
+}
 {
    bug_369843
    Memcheck:Leak