Disable automatic handling of SEH exceptions in gtest

This turns hangs on win_dbg into actually crashes

R=machenbach@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2613033002
Cr-Commit-Position: refs/heads/master@{#42090}

test/unittests/run-all-unittests.cc

@@ -37,6 +37,9 @@ class DefaultPlatformEnvironment final : public ::testing::Environment {
 
 
 int main(int argc, char** argv) {
+  // Don't catch SEH exceptions and continue as the following tests might hang
+  // in an broken environment on windows.
+  testing::GTEST_FLAG(catch_exceptions) = false;
   testing::InitGoogleMock(&argc, argv);
   testing::AddGlobalTestEnvironment(new DefaultPlatformEnvironment);
   v8::V8::SetFlagsFromCommandLine(&argc, argv, true);