Update Dr. Memory browser_tests exclusions to test the full set of subtests

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
@@ skipping 24 matching lines @@
 # DrM-i#1052-c#56
 # InspectUITest.*
 # J*: 0    tests
 J*
 # K*: 1    tests
 K*
 # L*: 62   tests
 L*
 M*
 N*
-# O*
-# P*
-Q*
-R*
-S*
-T*
+O*
+P*
+# Q*
+# R*
+# S*
+# T*
 # U*: ~20  tests
 U*
 # DrM-i#1052-c#53
 # UnloadTest.*
 # V*: 5    tests
 V*
 # W*: ~150 tests
-W*
+# W*
 # X*: 0    tests
 X*
 # Y*: 0    tests
 Y*
 # Z*: 0    tests
 Z*
 
 # http://crbug.com/302993
 InstantNTPURLRewriteTest.UberURLHandler_InstantExtendedNewTabPage
 
 # http://crbug.com/328936
 IEImporterBrowserTest.IEImporter
 
 # http://crbug.com/332219
 IEImporterBrowserTest.IEImporterMalformedFavoritesRegistry