Allow getScale on all threads

Similar to the others we think is just thread safe enough to
not throw exception for now.

Change-Id: I19ce1babb7e371054d35926e18a35d30aef3b5b5
diff --git a/chromium/java/com/android/webview/chromium/WebViewChromium.java b/chromium/java/com/android/webview/chromium/WebViewChromium.java
index 7eff33b..a05eb72 100644
--- a/chromium/java/com/android/webview/chromium/WebViewChromium.java
+++ b/chromium/java/com/android/webview/chromium/WebViewChromium.java
@@ -471,7 +471,7 @@
 
     @Override
     public float getScale() {
-        checkThread();
+        // No checkThread() as it is mostly thread safe (workaround for b/10652991).
         return mAwContents.getScale();
     }