Remove unused context in ChromePreferenceManager.

chrome/test/android/javatests/src/org/chromium/chrome/test/BottomSheetTestCaseBase.java

Index: chrome/test/android/javatests/src/org/chromium/chrome/test/BottomSheetTestCaseBase.java
diff --git a/chrome/test/android/javatests/src/org/chromium/chrome/test/BottomSheetTestCaseBase.java b/chrome/test/android/javatests/src/org/chromium/chrome/test/BottomSheetTestCaseBase.java
index 480197bfd1c46649c89a832ca6e4b050562737a5..6a81592403e5b85097e68ee01ecfc4907f768ebe 100644
--- a/chrome/test/android/javatests/src/org/chromium/chrome/test/BottomSheetTestCaseBase.java
+++ b/chrome/test/android/javatests/src/org/chromium/chrome/test/BottomSheetTestCaseBase.java
@@ -26,8 +26,7 @@ public abstract class BottomSheetTestCaseBase extends ChromeTabbedActivityTestBa
         // TODO(dgn,mdjones): Chrome restarts when the ChromeHome feature flag value changes. That
         // crashes the test so we need to manually set the preference to match the flag before
         // Chrome initialises via super.setUp()
-        ChromePreferenceManager prefManager =
-                ChromePreferenceManager.getInstance(getInstrumentation().getTargetContext());
+        ChromePreferenceManager prefManager = ChromePreferenceManager.getInstance();
         mOldChromeHomeFlagValue = prefManager.isChromeHomeEnabled();
         prefManager.setChromeHomeEnabled(true);
 
@@ -52,8 +51,7 @@ public abstract class BottomSheetTestCaseBase extends ChromeTabbedActivityTestBa
     @Override
     protected void tearDown() throws Exception {
         super.tearDown();
-        ChromePreferenceManager.getInstance(getInstrumentation().getTargetContext())
-                .setChromeHomeEnabled(mOldChromeHomeFlagValue);
+        ChromePreferenceManager.getInstance().setChromeHomeEnabled(mOldChromeHomeFlagValue);
     }
 
     protected BottomSheetContent getBottomSheetContent() {