Refactor AXPlatformNodeWinUnittests test names

Refactored AXPlatformNodeWinUnittests test names to drop *Test in order
to comply with standards. There is no functionality changes.

For example:
BEFORE: TEST_F(AXPlatformNodeWinTest, TestIAccessibleLocation)
AFTER:  TEST_F(AXPlatformNodeWinTest, IAccessibleLocation)

Change-Id: Ic90e1d8dbfd1fb8fc4e4e400ba0aba27929e70e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2199022Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Victor Fei <vicfei@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#768881}

ui/accessibility/platform/ax_platform_node_win.h

@@ -1158,7 +1158,7 @@ class AX_EXPORT __declspec(uuid("26f5641a-246d-457b-a96d-07f3fae6acf2"))
   static void SanitizeStringAttributeForIA2(const std::string& input,
                                             std::string* output);
   FRIEND_TEST_ALL_PREFIXES(AXPlatformNodeWinTest,
-                           TestSanitizeStringAttributeForIA2);
+                           SanitizeStringAttributeForIA2);
 
  private:
   bool IsWebAreaForPresentationalIframe();