Fix inconsistent and incorrect Roboto Medium usage

chrome/android/java/res/values-v17/styles.xml

Index: chrome/android/java/res/values-v17/styles.xml
diff --git a/chrome/android/java/res/values-v17/styles.xml b/chrome/android/java/res/values-v17/styles.xml
index 80b0593e5c4d1732de12db6cfc435e105e557da3..09c67660347276d006e403001eacac29df7f95a0 100644
--- a/chrome/android/java/res/values-v17/styles.xml
+++ b/chrome/android/java/res/values-v17/styles.xml
@@ -130,10 +130,9 @@
         <item name="android:paddingTop">16dp</item>
         <item name="android:layout_marginBottom">16dp</item>
     </style>
-    <style name="PreferenceCategoryTextStyle">
+    <style name="PreferenceCategoryTextStyle" parent="RobotoMediumStyle">
         <item name="android:textColor">@color/pref_accent_color</item>
         <item name="android:textSize">12sp</item>
-        <item name="android:textStyle">bold</item>
     </style>
     <style name="PreferenceTitle">
         <item name="android:ellipsize">end</item>
@@ -720,7 +719,7 @@
         <item name="android:textSize">14sp</item>
         <item name="android:lineSpacingMultiplier">1.2</item>
     </style>
-    <style name="IncognitoNewTabLearnMoreLink">
+    <style name="IncognitoNewTabLearnMoreLink" parent="RobotoMediumStyle">
         <item name="android:background">?attr/listChoiceBackgroundIndicator</item>
         <item name="android:clickable">true</item>
         <item name="android:focusable">true</item>