Disable ImeTest#testFinishComposingText and...

Disable ImeTest#testFinishComposingText and ImeTest#testEnterKeyEventWhileComposingText since they are flaking.

BUG=411756,315548
TBR=aurimas@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/562513002

Cr-Commit-Position: refs/heads/master@{#294077}

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

@@ -317,8 +317,11 @@ public class ImeTest extends ContentShellTestBase {
         assertWaitForKeyboardStatus(true);
     }
 
+    /*
     @SmallTest
     @Feature({"TextInput", "Main"})
+    */
+    @DisabledTest
     public void testFinishComposingText() throws Throwable {
         DOMUtils.focusNode(mContentViewCore, "input_radio");
         assertWaitForKeyboardStatus(false);