[Android WebView] Fix some findbugs warnings.

M D DLS: Dead store to imageUrl in
org.chromium.android_webview.test.AwContentsClientShouldInterceptRequestTest.testCalledForImage()
At AwContentsClientShouldInterceptRequestTest.java
M D DLS: Dead store to onPageFinishedCallCount in
org.chromium.android_webview.test.AwContentsClientShouldInterceptRequestTest.testOnLoadResourceCalledWithCorrectUrl()
At AwContentsClientShouldInterceptRequestTest.java
M D SF: Switch statement found in
org.chromium.android_webview.AwContents$IoThreadClientHandler.handleMessage(Message)
where default case is missing  At AwContents.java
M P SIC: Should
org.chromium.android_webview.test.AwContentsClientShouldIgnoreNavigationTest$TestAwContentsClient$ShouldIgnoreNavigationHelper
be a _static_ inner class?  At
AwContentsClientShouldIgnoreNavigationTest.java

Java only change and android bots are happy.
NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/11196016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@162360 0039d316-1c4b-4281-b951-d872f2087c98

android_webview/java/src/org/chromium/android_webview/AwContents.java

@@ -81,6 +81,9 @@ public class AwContents {
                     final String url = (String)msg.obj;
                     AwContents.this.mContentsClient.onLoadResource(url);
                     break;
+                default:
+                    throw new IllegalStateException(
+                            "IoThreadClientHandler: unhandled message " + msg.what);
             }
         }
     }

android_webview/javatests/src/org/chromium/android_webview/test/AwContentsClientShouldIgnoreNavigationTest.java

@@ -45,7 +45,7 @@ public class AwContentsClientShouldIgnoreNavigationTest extends AndroidWebViewTe
     private static class TestAwContentsClient
             extends org.chromium.android_webview.test.TestAwContentsClient {
 
-        public class ShouldIgnoreNavigationHelper extends CallbackHelper {
+        public static class ShouldIgnoreNavigationHelper extends CallbackHelper {
             private String mShouldIgnoreNavigationUrl;
             private String mPreviousShouldIgnoreNavigationUrl;
             private boolean mShouldIgnoreNavigationReturnValue = false;

android_webview/javatests/src/org/chromium/android_webview/test/AwContentsClientShouldInterceptRequestTest.java

@@ -168,7 +168,6 @@ public class AwContentsClientShouldInterceptRequestTest extends AndroidWebViewTe
         final String aboutPageUrl = addAboutPageToTestServer(mWebServer);
 
         int callCount = onLoadResourceHelper.getCallCount();
-        int onPageFinishedCallCount = contentsClient.getOnPageFinishedHelper().getCallCount();
 
         loadUrlAsync(awContents, aboutPageUrl);
 
@@ -269,7 +268,7 @@ public class AwContentsClientShouldInterceptRequestTest extends AndroidWebViewTe
             contentsClient.getShouldInterceptRequestHelper();
 
         final String imagePath = "/" + CommonResources.FAVICON_FILENAME;
-        final String imageUrl = mWebServer.setResponseBase64(imagePath,
+        mWebServer.setResponseBase64(imagePath,
                 CommonResources.FAVICON_DATA_BASE64, CommonResources.getImagePngHeaders(true));
         final String pageWithImage =
             addPageToTestServer(mWebServer, "/page_with_image.html",