adjust browser_tests exclusion list for DrMemory to find suitable tests

tools/valgrind/gtest_exclude/browser_tests.gtest-drmemory_win32.txt

 # TODO(zhaoqin): File bugs for those failing browser tests.
 
 # Dr.Memory i#1052: http://code.google.com/p/drmemory/issues/detail?id=1052
 #
 # The list is too long for gtest_filter, so we exclude the whole
 # test case if any of its tests failed.
 *FLAKY*
 
 # it takes too long to run all browser_tests with Dr.Memory,
 # and we only select subset to run
 # A*: ~120 tests
-Acti*
-Ad*
-All*
-App*
-Auto*
-B*
+A*
+#B*
 C*
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