Fixes CatchFail build warnings in browser/locale tests.

Throws an AssertionError with the stack trace instead of calling
Assert.fail() with just a message.

Change-Id: I7ade80ee96e5feb4e5fc7a2b92f04af9c148a14b
Reviewed-on: https://chromium-review.googlesource.com/876244Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Troy Hildebrandt <thildebr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#530618}

chrome/android/javatests/src/org/chromium/chrome/browser/locale/DefaultSearchEnginePromoDialogTest.java

@@ -47,7 +47,7 @@ public class DefaultSearchEnginePromoDialogTest {
                     ChromeBrowserInitializer.getInstance(InstrumentationRegistry.getTargetContext())
                             .handleSynchronousStartup();
                 } catch (ProcessInitException e) {
-                    Assert.fail("Failed to initialize Chrome process");
+                    throw new AssertionError("Failed to initialize Chrome process.", e);
                 }
 
                 LocaleManager mockManager = new LocaleManager() {

chrome/android/javatests/src/org/chromium/chrome/browser/locale/LocaleManagerReferralTest.java

@@ -56,7 +56,7 @@ public class LocaleManagerReferralTest {
                     ChromeBrowserInitializer.getInstance(InstrumentationRegistry.getTargetContext())
                             .handleSynchronousStartup();
                 } catch (ProcessInitException e) {
-                    Assert.fail("Failed to load browser");
+                    throw new AssertionError("Failed to load browser.", e);
                 }
             }
         });

chrome/android/javatests/src/org/chromium/chrome/browser/locale/LocaleManagerTest.java

@@ -41,7 +41,7 @@ public class LocaleManagerTest {
                     ChromeBrowserInitializer.getInstance(InstrumentationRegistry.getTargetContext())
                             .handleSynchronousStartup();
                 } catch (ProcessInitException e) {
-                    Assert.fail("Failed to load browser");
+                    throw new AssertionError("Failed to load browser.", e);
                 }
             }
         });