Revert 96592 - Add scroll and gesture message filters for UIPI Flash.

Flash forwards some window messages when it has no handler set. The only ones I've observed are WM_MOUSEWHEEL and WM_GESTURE (gestures are supported only on Win7). So, we need to allow these messages through the UIPI boundary. 

One important note is that I use per-process message filters on Vista, but per-window filters on Win7 or later (because they're supported). 

BUG=86810
TEST=None.
Review URL: http://codereview.chromium.org/7617019

TBR=jschuh@chromium.org
Review URL: http://codereview.chromium.org/7648011

git-svn-id: http://src.chromium.org/svn/trunk/src/build@96661 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -1749,8 +1749,8 @@
     ['OS=="win"', {
       'target_defaults': {
         'defines': [
-          '_WIN32_WINNT=0x0601',
-          'WINVER=0x0601',
+          '_WIN32_WINNT=0x0600',
+          'WINVER=0x0600',
           'WIN32',
           '_WINDOWS',
           'NOMINMAX',