Changes "data saved" font from medium to regular on Data Saver home

Current implementation does not match spec.

Bug: 834081
Change-Id: Ida585a10e38d002e1fc9333f1e16eeeb9dfc93d6
Reviewed-on: https://chromium-review.googlesource.com/1016000Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Doug Arnett <dougarnett@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551704}

chrome/android/java/res/layout/data_reduction_stats_layout.xml

@@ -40,7 +40,7 @@
                     android:layout_marginTop="3dp"
                     android:paddingStart="3dp"
                     android:text="@string/data_reduction_savings_label"
-                    android:textAppearance="@style/PreferenceCategoryTextStyle" />
+                    android:textAppearance="@style/BlueLink2" />
 
             </LinearLayout>