Remove unnecessary flags in IME tests

These features have already launched, so no need to enable them for
tests.

Bug: 1068182
Change-Id: I86464e0b420b42b5b945e40166276c1dd6c968b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2140294Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Commit-Queue: Changwan Ryu <changwan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757185}

content/public/android/javatests/src/org/chromium/content/browser/input/ImeInputActionTest.java

@@ -13,7 +13,6 @@ import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
-import org.chromium.base.test.util.CommandLineFlags;
 import org.chromium.base.test.util.Feature;
 import org.chromium.content_public.browser.test.ContentJUnit4ClassRunner;
 import org.chromium.ui.base.ime.TextInputAction;
@@ -23,7 +22,6 @@ import org.chromium.ui.base.ime.TextInputType;
  * IME (input method editor) and text input tests for enterkeyhint attribute.
  */
 @RunWith(ContentJUnit4ClassRunner.class)
-@CommandLineFlags.Add({"enable-experimental-web-platform-features"})
 public class ImeInputActionTest {
     @Rule
     public ImeActivityTestRule mRule = new ImeActivityTestRule();

content/public/android/javatests/src/org/chromium/content/browser/input/ImeInputModeTest.java

@@ -13,7 +13,6 @@ import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
-import org.chromium.base.test.util.CommandLineFlags;
 import org.chromium.base.test.util.Feature;
 import org.chromium.blink_public.web.WebTextInputMode;
 import org.chromium.content_public.browser.test.ContentJUnit4ClassRunner;
@@ -23,7 +22,6 @@ import org.chromium.ui.base.ime.TextInputType;
  * IME (input method editor) and text input tests for input-mode attribute.
  */
 @RunWith(ContentJUnit4ClassRunner.class)
-@CommandLineFlags.Add({"enable-experimental-web-platform-features"})
 public class ImeInputModeTest {
     @Rule
     public ImeActivityTestRule mRule = new ImeActivityTestRule();