Autoplay: disable muted video autoplay if data saver is on.

third_party/WebKit/Source/core/html/HTMLMediaElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
index 79e041bfec69f2a9bf8b83b4269f2cda819acd28..fd5da689daeeb82e2e8fd1ce5960b3747ebd1630 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
@@ -3686,8 +3686,13 @@ bool HTMLMediaElement::isGestureNeededForPlayback() const
     if (!m_lockedPendingUserGesture)
         return false;
 
-    if (muted() && RuntimeEnabledFeatures::autoplayMutedVideosEnabled())
+    // We want to allow muted video to autoplay if:
+    // - the flag is enabled;
+    // - Data Saver is not enabled;
+    if (muted() && RuntimeEnabledFeatures::autoplayMutedVideosEnabled()
+        && !(document().settings() && document().settings()->dataSaverEnabled())) {
         return false;
+    }
 
     if (m_autoplayHelper->isGestureRequirementOverridden())
         return false;