adjust browser_tests exclusion list for Dr.Memory bots

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
 A*
-#B*
+# B*: ~230 tests
+BackgroundApp*.R*
+BluetoothSocketApi*.P*
+BookmarksT*.B*
+BookmarksT*.C*
+BrowserAcc*
+BrowserActionA*.I*
+BrowserCloseManagerB*/*.PRE*
+BrowserCloseManagerB*/*.Test*
+BrowserCloseManagerW*/*.TestWithDownloadsF*
+BrowserN*.D*
+BrowserN*.N*
+BrowserTest.P*
 C*
 D*
 E*
 F*
 G*
 H*
 I*
 J*
 K*
 L*
 M*
 N*
 O*
 P*
 Q*
 R*
 S*
 T*
 U*
 V*
 W*
 X*
 Y*
 Z*