Add target_build_type flag to bisect-perf-regression tool to enable bisecting of a Debug build with…

tools/bisect-manual-test.py

Index: tools/bisect-manual-test.py
diff --git a/tools/bisect-manual-test.py b/tools/bisect-manual-test.py
index 81519cb0cf4de393d87380738ea519c63fe8239f..b25673afea8ab18c5a8743cae5612af45eb37226 100755
--- a/tools/bisect-manual-test.py
+++ b/tools/bisect-manual-test.py
@@ -21,8 +21,6 @@ def _StartManualTest(options):
   browser_to_create = browser_finder.FindBrowser(options)
   print 'Starting browser: %s.' % options.browser_type
   with browser_to_create.Create() as browser:
-    browser.Start();
-
     # Loop until we get a response that we can parse.
     while True:
       sys.stderr.write('Revision is [(g)ood/(b)ad]: ')
@@ -34,9 +32,6 @@ def _StartManualTest(options):
           print "RESULT manual_test: manual_test= 0"
         break
 
-    browser.Close()
-
-
 def main():
   usage = ('%prog [options]\n'
            'Starts browser with an optional url and asks user whether '