Switch speech synthesis from compile-flag to runtime-flag.

Source/core/page/RuntimeEnabledFeatures.h

Index: Source/core/page/RuntimeEnabledFeatures.h
diff --git a/Source/core/page/RuntimeEnabledFeatures.h b/Source/core/page/RuntimeEnabledFeatures.h
index 9422c8646daea9eb430cd636eb81b9c8ce5029dd..36d662396a1219afb29811152d6158bf3f6dfdc3 100644
--- a/Source/core/page/RuntimeEnabledFeatures.h
+++ b/Source/core/page/RuntimeEnabledFeatures.h
@@ -224,6 +224,9 @@ public:
     static void setIMEAPIEnabled(bool isEnabled) { isIMEAPIEnabled = isEnabled; }
     static bool imeAPIEnabled() { return isIMEAPIEnabled; }
 
+    static void setSpeechSynthesisEnabled(bool isEnabled) { isSpeechSynthesisEnabled = isEnabled; }

[eseidel, 2013/04/29 21:50:51]

I suspect I just broke thsi part of the diff.  These are now autogenerated as of
about 10 minutes ago. :)  There is a RuntimeEnabledFeatures.in file.

+    static bool speechSynthesisEnabled() { return isSpeechSynthesisEnabled; }
+
 private:
     // Never instantiate.
     RuntimeEnabledFeatures() { }
@@ -291,6 +294,7 @@ private:
     static bool isDirectoryUploadEnabled;
     static bool isExperimentalWebSocketEnabled;
     static bool isIMEAPIEnabled;
+    static bool isSpeechSynthesisEnabled;
 };
 
 } // namespace WebCore