Disable SafeBrowsingModuleVerifierWinTest.VerifyModuleLongModification on Win7 dbg

It is flaky

TBR=caitkp@chromium.org

Bug: 838124
Change-Id: If142522d8c3cbf996775deabfb3e03012b192908
Reviewed-on: https://chromium-review.googlesource.com/1034902Reviewed-by: Christos Froussios <cfroussios@chromium.org>
Commit-Queue: Christos Froussios <cfroussios@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554749}

chrome/browser/safe_browsing/incident_reporting/module_integrity_verifier_win_unittest.cc

@@ -20,6 +20,7 @@
 #include "base/scoped_native_library.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/win/pe_image.h"
+#include "build/build_config.h"
 #include "chrome/browser/safe_browsing/incident_reporting/module_integrity_unittest_util_win.h"
 #include "components/safe_browsing/proto/csd.pb.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -234,7 +235,14 @@ TEST_F(SafeBrowsingModuleVerifierWinTest, VerifyModuleModified) {
             (uint8_t)state.modification(1).modified_bytes()[0]);
 }
 
-TEST_F(SafeBrowsingModuleVerifierWinTest, VerifyModuleLongModification) {
+// TODO(crbug.com/838124) The test is flaky on Win7 debug.
+#if defined(OS_WIN) && !defined(NDEBUG)
+#define MAYBE_VerifyModuleLongModification DISABLED_VerifyModuleLongModification
+#else
+#define MAYBE_VerifyModuleLongModification VerifyModuleLongModification
+#endif
+
+TEST_F(SafeBrowsingModuleVerifierWinTest, MAYBE_VerifyModuleLongModification) {
   ModuleState state;
   int num_bytes_different = 0;