Catch SecurityException in RadioUtils.getCellSignalLevel

It appears that on some devices the SignalStrength.getLevel method
requires the READ_PHONE_STATE permission that Chrome doesn't have.
This CL catches the exception to avoid crash in this case.

Bug: 1150536
Change-Id: I1fcbdbbe36d62cc48357e01f66654ca1c1fe5291
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2549967Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Eric Seckler <eseckler@chromium.org>
Commit-Queue: Mikhail Khokhlov <khokhlov@google.com>
Cr-Commit-Position: refs/heads/master@{#829654}

base/android/java/src/org/chromium/base/RadioUtils.java

@@ -97,8 +97,16 @@ public class RadioUtils {
         TelephonyManager telephonyManager =
                 (TelephonyManager) ContextUtils.getApplicationContext().getSystemService(
                         Context.TELEPHONY_SERVICE);
-        SignalStrength signalStrength = telephonyManager.getSignalStrength();
-        if (signalStrength == null) return -1;
-        return signalStrength.getLevel();
+        int level = -1;
+        try {
+            SignalStrength signalStrength = telephonyManager.getSignalStrength();
+            if (signalStrength != null) {
+                level = signalStrength.getLevel();
+            }
+        } catch (java.lang.SecurityException e) {
+            // Sometimes SignalStrength.getLevel() requires extra permissions
+            // that Chrome doesn't have. See crbug.com/1150536.
+        }
+        return level;
     }
 }