Remove some OS_ comments on #else lines.

Don't assume what the else case is, as they will go out of date if a new
platform ever gets added.

Change-Id: I08b3da4acd65cd9f8e2f1d605224b9c47b641da3
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/72031
Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

core/fpdfapi/render/fpdf_progressive_render_embeddertest.cpp

diff --git a/core/fpdfapi/render/fpdf_progressive_render_embeddertest.cpp b/core/fpdfapi/render/fpdf_progressive_render_embeddertest.cpp
index 02e9896..18005dc 100644
--- a/core/fpdfapi/render/fpdf_progressive_render_embeddertest.cpp
+++ b/core/fpdfapi/render/fpdf_progressive_render_embeddertest.cpp
@@ -372,7 +372,7 @@
 #if defined(OS_MACOSX)
   static constexpr char kMD5ContentWithHighlightFill[] =
       "a820afec9b99d3d3f2e9e9382bbad7c1";
-#else  // OS_WIN & OS_LINUX
+#else
   static constexpr char kMD5ContentWithHighlightFill[] =
       "a08a0639f89446f66f3689ee8e08b9fe";
 #endif
@@ -395,7 +395,7 @@
 #if defined(OS_MACOSX)
   static constexpr char kMD5ContentWithHighlight[] =
       "8837bea0b3520164b1784e513c882a2d";
-#else  // OS_WIN & OS_LINUX
+#else
   static constexpr char kMD5ContentWithHighlight[] =
       "3dd8c02f5c06bac85e0d2c8bf37d1dc4";
 #endif
@@ -413,7 +413,7 @@
 #if defined(OS_WIN)
   static constexpr char kMD5ContentWithInk[] =
       "1933e4ab19b9108ddcecd1a6abb20c85";
-#else  // OS_MACOSX & OS_LINUX
+#else
   static constexpr char kMD5ContentWithInk[] =
       "797bce7dc6c50ee86b095405df9fe5aa";
 #endif