Remove strict mode violation exception in WebLayer class loader

This may not be needed anymore, bots seem to pass without it. It looks
like this was significantly slowing down startup, so if this does pop up
again we probably want to find a better way to deal with it.

Startup time improvements:
7.9% on android-go: https://pinpoint-dot-chromeperf.appspot.com/job/15b854a9520000
10.7% on Pixel 2: https://pinpoint-dot-chromeperf.appspot.com/job/12c81a5b520000

3.7% improvement in first contentful paint: https://pinpoint-dot-chromeperf.appspot.com/job/16b631cd520000

Bug: 1146438, 1112001
Change-Id: Icb2dd4333146c866bf67048040414c965eb93513
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2535615Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827286}

weblayer/public/java/org/chromium/weblayer/WebViewCompatibilityHelper.java

@@ -50,19 +50,7 @@ final class WebViewCompatibilityHelper {
             // matches what Android does when constructing class loaders, see
             // android.app.ApplicationLoaders.
             return new PathClassLoader(
-                    dexPath, librarySearchPath, ClassLoader.getSystemClassLoader().getParent()) {
-                @Override
-                public Class<?> loadClass(String name) throws ClassNotFoundException {
-                    // TODO(crbug.com/1112001): Investigate why loading classes causes strict mode
-                    // violations in some situations.
-                    StrictMode.ThreadPolicy oldPolicy = StrictMode.allowThreadDiskReads();
-                    try {
-                        return super.loadClass(name);
-                    } finally {
-                        StrictMode.setThreadPolicy(oldPolicy);
-                    }
-                }
-            };
+                    dexPath, librarySearchPath, ClassLoader.getSystemClassLoader().getParent());
         } finally {
             StrictMode.setThreadPolicy(oldPolicy);
         }