Fixed exception when calling Google.IOSResolver.RemapXcodeExtension().

Google.IOSResolver.RemapXcodeExtension() would throw an exception if
Unity's iOS support wasn't installed.  This changes IOSResolver to
catch both FileNotFoundException and TypeInitializationException
exceptions.

BUG=31336359

Change-Id: I1de17454c3fa23e9ddd74873849c99712411de98

Author: Stewart Miles

exploded/Assets/PlayServicesResolver/Editor/Google.IOSResolver_v1.2.1.0.dll

@@ -271,11 +271,16 @@ static IOSResolver() {
         RemapXcodeExtension();
         try {
             TARGET_NAME = PBXProject.GetUnityTargetName();
-        } catch (FileNotFoundException) {
-            // It's likely we failed to load the iOS Xcode extension.
-            Debug.LogWarning(
-                "Failed to load the UnityEditor.iOS.Extensions.Xcode dll.  " +
-                "Is iOS support installed?");
+        } catch (Exception exception) {
+            if (exception is FileNotFoundException ||
+                exception is TypeInitializationException) {
+                // It's likely we failed to load the iOS Xcode extension.
+                Debug.LogWarning(
+                    "Failed to load the UnityEditor.iOS.Extensions.Xcode " +
+                    "dll.  Is iOS support installed?");
+            } else {
+                throw exception;
+            }
         }
     }