Make resource repacker work on Windows

tools/resources/find_used_resources.py

Index: tools/resources/find_used_resources.py
diff --git a/tools/resources/find_used_resources.py b/tools/resources/find_used_resources.py
index 3fc3bcef33920ab2188e2fa28e9702cc7a06be66..adce50e79d0e21c6dfddd19376e8f11543b523bc 100755
--- a/tools/resources/find_used_resources.py
+++ b/tools/resources/find_used_resources.py
@@ -21,6 +21,8 @@ to print out a UnknownPragma message every time a resource id is used. E.g.:
 foo.cc:22:0: warning: ignoring #pragma whitelisted_resource_12345
 [-Wunknown-pragmas]
 
+On Windows, the message is simply a message via __pragma(message(...)).

[Nico, 2014/04/14 23:42:00]

Hm, I wonder if we could do the same on non-win:

          #define DO_PRAGMA(x) _Pragma (#x)
          #define FOO(x) DO_PRAGMA(message ("TODO - " #x))
          

(from http://gcc.gnu.org/onlinedocs/gcc/Diagnostic-Pragmas.html)

[scottmg, 2014/04/14 23:45:20]

From the chromium-dev thread titled "generated_resources.grd" I got the
impression it didn't work for some reason? Maybe it does on a newer GCC or
something, Aurimas?

[aurimas (slooooooooow), 2014/04/14 23:53:05]

pragma message is not supported on gcc used to build Chrome for Android :(

+
 """
 
 
@@ -29,8 +31,8 @@ def GetResourceIdsInPragmaWarnings(input):
      for the given input.
   """
   used_resources = set()
-  unknown_pragma_warning_pattern = re.compile('warning: ignoring #pragma '
-      'whitelisted_resource_(?P<resource_id>[0-9]*)  \[-Wunknown-pragmas\]')
+  unknown_pragma_warning_pattern = re.compile(
+      'whitelisted_resource_(?P<resource_id>[0-9]*)')
   for ln in input:
     match = unknown_pragma_warning_pattern.search(ln)
     if match: