Fix the ChromeFrame BeginningTransaction unit test failures which validate the HttpNegotiate

patch. On IE6/7/8 the chrome frame user agent is added to the ua section in the registry. This
causes the test matcher to fail as the actual UA string contains the string chromeframe followed
by the version of the dll.

Fix is to reduce the scope of the matcher to just look for the string chromeframe.

BUG=none
TEST=Covered by existing chrome frame BeginningTransaction test.
TBR=amit


Review URL: http://codereview.chromium.org/6045001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@69591 0039d316-1c4b-4281-b951-d872f2087c98

chrome_frame/test/http_negotiate_unittest.cc

@@ -70,7 +70,7 @@ TEST_F(HttpNegotiateTest, BeginningTransaction) {
   std::wstring cf_tag(
       ASCIIToWide(http_utils::GetChromeFrameUserAgent()));
 
-  EXPECT_NE(std::wstring::npos, cf_ua.find(cf_tag));
+  EXPECT_NE(std::wstring::npos, cf_ua.find(L"chromeframe/"));
 
   struct TestCase {
     const std::wstring original_headers_;