Change FPDFLink_GetRect() to return a boolean.

BUG=pdfium:858

Change-Id: Ib8effb64a1622feb2837f536b36b9e46847a2210
Reviewed-on: https://pdfium-review.googlesource.com/22631
Reviewed-by: dsinclair <dsinclair@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/fpdfsdk/fpdftext_embeddertest.cpp b/fpdfsdk/fpdftext_embeddertest.cpp
index 6065405..6885eb0 100644
--- a/fpdfsdk/fpdftext_embeddertest.cpp
+++ b/fpdfsdk/fpdftext_embeddertest.cpp
@@ -365,7 +365,7 @@
   double right = 0.0;
   double top = 0.0;
   double bottom = 0.0;
-  FPDFLink_GetRect(pagelink, 0, 0, &left, &top, &right, &bottom);
+  EXPECT_TRUE(FPDFLink_GetRect(pagelink, 0, 0, &left, &top, &right, &bottom));
   EXPECT_NEAR(50.791, left, 0.001);
   EXPECT_NEAR(187.963, right, 0.001);
   EXPECT_NEAR(97.624, bottom, 0.001);
@@ -376,7 +376,7 @@
   right = -1.0;
   top = -1.0;
   bottom = -1.0;
-  FPDFLink_GetRect(pagelink, 0, 1, &left, &top, &right, &bottom);
+  EXPECT_FALSE(FPDFLink_GetRect(pagelink, 0, 1, &left, &top, &right, &bottom));
   EXPECT_EQ(-1.0, left);
   EXPECT_EQ(-1.0, right);
   EXPECT_EQ(-1.0, bottom);
@@ -387,7 +387,7 @@
   right = -2.0;
   top = -2.0;
   bottom = -2.0;
-  FPDFLink_GetRect(pagelink, -1, 0, &left, &top, &right, &bottom);
+  EXPECT_FALSE(FPDFLink_GetRect(pagelink, -1, 0, &left, &top, &right, &bottom));
   EXPECT_EQ(-2.0, left);
   EXPECT_EQ(-2.0, right);
   EXPECT_EQ(-2.0, bottom);