adjust browser_tests drmemory exclusion list 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*: ~70  tests
-A*
-# DrM-i#1052-c#52
-# AutofillTest.*
-# AcceleratedCompositingBlockedTest.*
-# AppApiTest.*
-# BrowserAccessibilityStateImplTest.*
+# A*
 B*
-# C*: ~190 tests
+C*
 D*
 E*
 F*
 G*
-# H*: ~52  tests
-# DrM-i#1052-c#53
-HistoryWebUITest.*
-# I*: ~10  tests
-# DrM-i#1052-c#53
-InfoBarsTest.*
-# DrM-i#1052-c#56
-InspectUITest.*
-# J*: 0    tests
-# K*: 1    tests
-# L*: 62   tests
+H*
+I*
+J*
+K*
+L*
 M*
 N*
 O*
 P*
 Q*
 R*
 S*
 T*
-# U*: ~20  tests
-# DrM-i#1052-c#53
-UnloadTest.*
-# V*: 5    tests
-# W*: ~150 tests
+U*
+V*
 W*
-# X*: 0    tests
-# Y*: 0    tests
-# Z*: 0    tests
-
-# http://crbug.com/302993
-InstantNTPURLRewriteTest.UberURLHandler_InstantExtendedNewTabPage
-
-# http://crbug.com/328936
-IEImporterBrowserTest.IEImporter
-
-# http://crbug.com/332219
-IEImporterBrowserTest.IEImporterMalformedFavoritesRegistry
+X*
+Y*
+Z*