Stops using SYSTEM_STATE_INDETERMINATE as it makes radio buttons appear to have a mixed state.

chrome/common/extensions/api/automation.idl

Index: chrome/common/extensions/api/automation.idl
diff --git a/chrome/common/extensions/api/automation.idl b/chrome/common/extensions/api/automation.idl
index c6f02b9b9c3cce59b177f9cee2841106b663c388..c21a8936efa7fe8e4f03286005894e49956bb5bc 100644
--- a/chrome/common/extensions/api/automation.idl
+++ b/chrome/common/extensions/api/automation.idl
@@ -195,7 +195,6 @@
     haspopup,
     horizontal,
     hovered,
-    indeterminate,
     invisible,
     linked,
     multiline,
@@ -262,7 +261,7 @@
     object? state;
 
     // A map of attribute name to expected value, for example
-    // <code>{ name: 'Root directory', button_mixed: true }</code>.
+    // <code>{ name: 'Root directory', checkbox_mixed: true }</code>.
     // String attribute values may be specified as a regex, for example
     // <code>{ name: /stralia$/</code> }</code>.
     // Unless specifying a regex, the expected value must be an exact match