New implementation of font precache on Windows.

chrome/renderer/chrome_render_process_observer.cc

Index: chrome/renderer/chrome_render_process_observer.cc
diff --git a/chrome/renderer/chrome_render_process_observer.cc b/chrome/renderer/chrome_render_process_observer.cc
index 380213abcb8e9a0d67df5d2f27d421c1a7a860f8..a3c8ff2335356f86865487f7c07315f429d59219 100644
--- a/chrome/renderer/chrome_render_process_observer.cc
+++ b/chrome/renderer/chrome_render_process_observer.cc
@@ -45,6 +45,7 @@
 
 #if defined(OS_WIN)
 #include "base/win/iat_patch_function.h"
+#include "content/common/child_process_messages.h"
 #endif
 
 #if defined(OS_MACOSX)
@@ -165,6 +166,7 @@ DWORD WINAPI GetFontDataPatch(HDC hdc,
       std::vector<char> font_data;
       if (RenderThread::current()->Send(new ViewHostMsg_PreCacheFont(logfont)))
         rv = GetFontData(hdc, table, offset, buffer, length);
+        RenderThread::current()->Send(new ViewHostMsg_ReleaseCachedFonts);
     }
   }
   return rv;